MLECO-2944: CMSIS device refactoring

* RTE_components header to include corresponding Arm Cortex-M system header
* remove custom CMSIS implementation from repo
* use templates within CMSIS repo instead
* update cmake to use header and source files within CMSIS repo

Change-Id: I3534dae97b93c07a5056471b1d1dedbc78f00aa7
diff --git a/source/hal/cmsis_device/CMakeLists.txt b/source/hal/cmsis_device/CMakeLists.txt
index 9f834d5..255bd30 100644
--- a/source/hal/cmsis_device/CMakeLists.txt
+++ b/source/hal/cmsis_device/CMakeLists.txt
@@ -50,8 +50,12 @@
 ## Sources
 target_sources(${CMSIS_DEVICE_TARGET}
     PRIVATE
-    source/cmsis.c
-    source/irqs.c)
+    ${CMSIS_SRC_PATH}/Device/ARM/${ARM_CPU}/Source/system_${ARM_CPU}.c
+    ${CMSIS_SRC_PATH}/Device/ARM/${ARM_CPU}/Source/startup_${ARM_CPU}.c)
+
+# Device definition needs to be set, is checked in source files to include correct header
+target_compile_definitions(${CMSIS_DEVICE_TARGET} PUBLIC ${ARM_CPU})
+
 
 # Tell linker that reset interrupt handler is our entry point
 target_link_options(