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/scripts/config.pl b/scripts/config.pl
index 006a58d..ff862be 100755
--- a/scripts/config.pl
+++ b/scripts/config.pl
@@ -1,6 +1,6 @@
 #!/usr/bin/env perl
 #
-# Copyright (c) 2014-2016, ARM Limited, All Rights Reserved
+# Copyright The Mbed TLS Contributors
 # SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 #
 # This file is provided under the Apache License 2.0, or the
@@ -42,8 +42,6 @@
 #
 # **********
 #
-# This file is part of Mbed TLS (https://tls.mbed.org)
-#
 # Purpose
 #
 # Comments and uncomments #define lines in the given header file and optionally