Platform: Add arm folder for arm platforms

Put arm platforms into arm folder and remove some unused
cryptocell-312-runtime. It will be convenient for users and
developers.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: I1187a8f2b18903e531ce28b2d23be251ec1e2b45
diff --git a/docs/getting_started/tfm_build_instruction.rst b/docs/getting_started/tfm_build_instruction.rst
index 403fccd..f64528a 100644
--- a/docs/getting_started/tfm_build_instruction.rst
+++ b/docs/getting_started/tfm_build_instruction.rst
@@ -262,7 +262,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_GNUARM.cmake -DCMAKE_BUILD_TYPE=Debug
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_GNUARM.cmake -DCMAKE_BUILD_TYPE=Debug
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -272,7 +272,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_GNUARM.cmake
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_GNUARM.cmake
     make install
 
 .. Note::
@@ -292,7 +292,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_ARMCLANG.cmake -DTEST_S=ON -DTEST_NS=ON
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_ARMCLANG.cmake -DTEST_S=ON -DTEST_NS=ON
     cmake --build cmake_build -- install
 
 Regression Tests for the AN521 target platform
@@ -306,7 +306,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTEST_S=ON -DTEST_NS=ON
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTEST_S=ON -DTEST_NS=ON
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -316,7 +316,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DTEST_S=ON -DTEST_NS=ON
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTEST_S=ON -DTEST_NS=ON
     make install
 
 Build for PSA Functional API compliance tests
@@ -342,7 +342,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTEST_PSA_API=CRYPTO
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTEST_PSA_API=CRYPTO
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -352,7 +352,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DTEST_PSA_API=CRYPTO
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTEST_PSA_API=CRYPTO
     make install
 
 Build for PSA FF (IPC) compliance tests
@@ -368,7 +368,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTEST_PSA_API=IPC -DTFM_PSA_API=ON
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTEST_PSA_API=IPC -DTFM_PSA_API=ON
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -378,7 +378,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DTEST_PSA_API=IPC -DTFM_PSA_API=ON
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTEST_PSA_API=IPC -DTFM_PSA_API=ON
     make install
 
 Location of build artifacts
@@ -419,7 +419,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_doc -DTFM_PLATFORM=mps2/an521
+    cmake -S . -B cmake_doc -DTFM_PLATFORM=arm/mps2/an521
     cmake --build cmake_doc -- tfm_docs_refman_html tfm_docs_refman_pdf
 
 The documentation files will be available under the directory::
@@ -431,7 +431,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_doc -DTFM_PLATFORM=mps2/an521
+    cmake -S . -B cmake_doc -DTFM_PLATFORM=arm/mps2/an521
     cmake --build cmake_doc -- tfm_docs_userguide_html tfm_docs_userguide_pdf
 
 The documentation files will be available under the directory::
@@ -553,7 +553,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DMBEDCRYPTO_PATH=<Mbed Crypto base folder>/mbedtls
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DMBEDCRYPTO_PATH=<Mbed Crypto base folder>/mbedtls
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -563,7 +563,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DMBEDCRYPTO_PATH=<Mbed Crypto base folder>/mbedtls
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DMBEDCRYPTO_PATH=<Mbed Crypto base folder>/mbedtls
     make install
 
 --------------
diff --git a/docs/getting_started/tfm_build_instruction_iar.rst b/docs/getting_started/tfm_build_instruction_iar.rst
index a320488..b9e8b2d 100644
--- a/docs/getting_started/tfm_build_instruction_iar.rst
+++ b/docs/getting_started/tfm_build_instruction_iar.rst
@@ -28,7 +28,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_IARARM.cmake
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_IARARM.cmake
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -38,7 +38,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_IARARM.cmake
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_IARARM.cmake
     make install
 
 Regression Tests for the AN521 target platform
@@ -47,7 +47,7 @@
 .. code-block:: bash
 
     cd <TF-M base folder>
-    cmake -S . -B cmake_build -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_IARARM.cmake -DTEST_S=ON -DTEST_NS=ON
+    cmake -S . -B cmake_build -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=toolchain_IARARM.cmake -DTEST_S=ON -DTEST_NS=ON
     cmake --build cmake_build -- install
 
 Alternately using traditional cmake syntax
@@ -57,7 +57,7 @@
     cd <TF-M base folder>
     mkdir cmake_build
     cd cmake_build
-    cmake .. -DTFM_PLATFORM=mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_IARARM.cmake -DTEST_S=ON -DTEST_NS=ON
+    cmake .. -DTFM_PLATFORM=arm/mps2/an521 -DTFM_TOOLCHAIN_FILE=../toolchain_IARARM.cmake -DTEST_S=ON -DTEST_NS=ON
     make install
 
  *Copyright (c) 2020-2021, Arm Limited. All rights reserved.*
diff --git a/docs/getting_started/tfm_user_guide.rst b/docs/getting_started/tfm_user_guide.rst
index d2b0193..bd9ce91 100644
--- a/docs/getting_started/tfm_user_guide.rst
+++ b/docs/getting_started/tfm_user_guide.rst
@@ -224,7 +224,7 @@
 .. Note::
 
     Before executing any images on Musca-B1 board, please check the
-    :doc:`target platform readme </platform/ext/target/musca_b1/sse_200/readme>`
+    :doc:`target platform readme </platform/ext/target/arm/musca_b1/sse_200/readme>`
     to have the correct setup.
 
 Example application with BL2 bootloader
@@ -416,7 +416,7 @@
 ============================================================================
 
 Follow the above procedures, but to create a unified hex please check the
-:doc:`Musca-B1 Secure Enclave readme </platform/ext/target/musca_b1/secure_enclave/readme>`.
+:doc:`Musca-B1 Secure Enclave readme </platform/ext/target/arm/musca_b1/secure_enclave/readme>`.
 
 ********************************************************
 Execute TF-M example and regression tests on MPS3 boards