Update copyright notices to use Linux Foundation guidance

As a result, the copyright of contributors other than Arm is now
acknowledged, and the years of publishing are no longer tracked in the
source files.

Also remove the now-redundant lines declaring that the files are part of
MbedTLS.

This commit was generated using the following script:

# ========================
#!/bin/sh

# Find files
find '(' -path './.git' -o -path './3rdparty' ')' -prune -o -type f -print | xargs sed -bi '

# Replace copyright attribution line
s/Copyright.*Arm.*/Copyright The Mbed TLS Contributors/I

# Remove redundant declaration and the preceding line
$!N
/This file is part of Mbed TLS/Id
P
D
'
# ========================

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 339fad2..a316166 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -3,7 +3,7 @@
  * \brief Platform Security Architecture cryptography module
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/include/psa/crypto_accel_driver.h b/include/psa/crypto_accel_driver.h
index 4a540f0..1a193c5 100644
--- a/include/psa/crypto_accel_driver.h
+++ b/include/psa/crypto_accel_driver.h
@@ -14,7 +14,7 @@
  */
 
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/include/psa/crypto_compat.h b/include/psa/crypto_compat.h
index cb2be7f..4b607b6 100644
--- a/include/psa/crypto_compat.h
+++ b/include/psa/crypto_compat.h
@@ -11,7 +11,7 @@
  * include psa/crypto.h.
  */
 /*
- *  Copyright (C) 2019, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -25,8 +25,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_COMPAT_H
diff --git a/include/psa/crypto_driver_common.h b/include/psa/crypto_driver_common.h
index 6f1a5d5..2ce75d2 100644
--- a/include/psa/crypto_driver_common.h
+++ b/include/psa/crypto_driver_common.h
@@ -17,7 +17,7 @@
  */
 
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/include/psa/crypto_entropy_driver.h b/include/psa/crypto_entropy_driver.h
index f596b6b..6175044 100644
--- a/include/psa/crypto_entropy_driver.h
+++ b/include/psa/crypto_entropy_driver.h
@@ -12,7 +12,7 @@
  */
 
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/include/psa/crypto_extra.h b/include/psa/crypto_extra.h
index afb16ad..f0c7979 100644
--- a/include/psa/crypto_extra.h
+++ b/include/psa/crypto_extra.h
@@ -9,7 +9,7 @@
  * This file is reserved for vendor-specific definitions.
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -23,8 +23,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_EXTRA_H
diff --git a/include/psa/crypto_platform.h b/include/psa/crypto_platform.h
index d85a719..77c0e5b 100644
--- a/include/psa/crypto_platform.h
+++ b/include/psa/crypto_platform.h
@@ -14,7 +14,7 @@
  * module implements.
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -28,8 +28,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_PLATFORM_H
diff --git a/include/psa/crypto_se_driver.h b/include/psa/crypto_se_driver.h
index 0c28579..46b2d64 100644
--- a/include/psa/crypto_se_driver.h
+++ b/include/psa/crypto_se_driver.h
@@ -16,7 +16,7 @@
  */
 
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index cc0eab4..f6373b8 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -21,7 +21,7 @@
  * implementation are in crypto.h.
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -35,8 +35,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_SIZES_H
diff --git a/include/psa/crypto_struct.h b/include/psa/crypto_struct.h
index 938abd0..67c53db 100644
--- a/include/psa/crypto_struct.h
+++ b/include/psa/crypto_struct.h
@@ -34,7 +34,7 @@
  * copy of the key.
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -48,8 +48,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_STRUCT_H
diff --git a/include/psa/crypto_types.h b/include/psa/crypto_types.h
index 29e1f29..17718eb 100644
--- a/include/psa/crypto_types.h
+++ b/include/psa/crypto_types.h
@@ -14,7 +14,7 @@
  * This header file does not declare any function.
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -28,8 +28,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_TYPES_H
diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index 73d7d9d..a940711 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -15,7 +15,7 @@
  * This header file only defines preprocessor macros.
  */
 /*
- *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0
  *
  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -29,8 +29,6 @@
  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 
 #ifndef PSA_CRYPTO_VALUES_H