CMSIS: Restructure ported CMSIS_5

See docs/adr/0001_cmsis_component_source_structure_recommendations.md
For details information.

Author: hugueskamba

.travis.yml

@@ -280,7 +280,7 @@ matrix:
         # Check that example compiles without rtos
         - sed -n '/``` cpp/,/```/{/```$/Q;/```/d;p;}' ${EVENTS}/README.md > main.cpp
         - |
-          rm -r rtos/source/TARGET_CORTEX drivers/source/usb connectivity/cellular connectivity/drivers/cellular \
+          rm -r cmsis/CMSIS_5/CMSIS/RTOS2 cmsis/device/rtos drivers/source/usb connectivity/cellular connectivity/drivers/cellular \
             connectivity/libraries/ppp connectivity/netsocket connectivity/nanostack connectivity/lwipstack features/frameworks/greentea-client \
             features/frameworks/utest features/frameworks/unity components BUILD
         - python tools/make.py -t GCC_ARM -m NUCLEO_F103RB --source=. --build=BUILD/NUCLEO_F103RB/GCC_ARM -j0

rtos/source/TARGET_CORTEX/rtx5/Include/cmsis_os2.h renamed to cmsis/CMSIS_5/CMSIS/RTOS2/Include/cmsis_os2.h

@@ -0,0 +1,3 @@
+{
+    "name": "cmsis-cmsis5-rtos2"
+}

rtos/source/TARGET_CORTEX/rtx5/Include/os_tick.h renamed to cmsis/CMSIS_5/CMSIS/RTOS2/Include/os_tick.h

@@ -23,7 +23,7 @@
 
 /* This startup is for baremetal. There is no RTOS in baremetal,
  * therefore we protect this file with MBED_CONF_RTOS_PRESENT.
- * Note: The start-up code for mbed OS is in rtos/source/TARGET_CORTEX/mbed_boot code file.
+ * Note: The start-up code for mbed OS is in cmsis/device/rtos/TOOLCHAIN_<TOOLCHAIN>/mbed_boot_<TOOLCHAIN>.c code file.
  */
 #if !defined(MBED_CONF_RTOS_PRESENT)