cmsis_6: Integrate with zephyr build system

Signed-off-by: Robin Kastberg <[email protected]>

Author: RobinKastberg

CMSIS/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+add_subdirectory(Core)

CMSIS/Core/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_include_directories(Include)
+
+# As of CMSIS v5.6.0, __PROGRAM_START is to indicate whether the
+# ARM vendor or the OS supplies data/bss init routine, otherwise
+# the default data/bss init routine for the selected toolchain is
+# added. We set the macro in build-time to guarantee compatibility
+# with all existing ARM platforms.
+
+zephyr_compile_definitions(__PROGRAM_START)

CMakeLists.txt

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+add_subdirectory(CMSIS)

zephyr/module.yml

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+build:
+  cmake-ext: true
+  kconfig-ext: true