EWARM-12658: Add CMSIS-R Profile to ICCARM

* Created cmsis_iccarm.h and moved generic intrinsics there
* Removed intrinsics which moved to cmsis_iccarm.h from
  cmsis_iccarm_a.h and cmsis_iccarm_m.h
* Removed support for __ICCARM_INTRINCS_VERSION__ < 2 since that was
  very hard to keep while doing this refactoring. It was supposed
  to happen when we went to CMSIS_6.
* As a side-effect, this refactoring will fix
  __CLREX and __STREX bugs fixed for Cortex-M that wasn't backported to
  Cortex-A.