CMake: Add support for cmsis dir

cmsis/CMakeLists.txt

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: Apache-2.0
+
+mbed_add_cmake_directory_if_labels("TARGET")
+
+target_sources(mbed-os
+    PRIVATE
+        RTE_Components.h
+)
+
+target_include_directories(mbed-os
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)

cmsis/TARGET_CORTEX_A/CMakeLists.txt

@@ -0,0 +1,19 @@
+# Copyright (c) 2020 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+target_sources(mbed-os
+    PRIVATE
+        irq_ctrl_gic.c
+)
+
+if(${MBED_TOOLCHAIN} STREQUAL "IAR")
+    target_sources(mbed-os
+        PRIVATE
+            TOOLCHAIN_IAR/cmain.S
+    )
+endif()
+
+target_include_directories(mbed-os
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)

cmsis/TARGET_CORTEX_M/CMakeLists.txt

@@ -0,0 +1,12 @@
+# Copyright (c) 2020 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+target_sources(mbed-os
+    PRIVATE
+        mbed_tz_context.c
+)
+
+target_include_directories(mbed-os
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}
+)