Merge changes from topic "spm-devel" into integration

* changes:
  spm-mm: Rename aarch64 assembly files
  spm-mm: Rename source files
  spm-mm: Rename spm_shim_private.h
  spm-mm: Rename spm_private.h
  spm-mm: Rename component makefile
  spm-mm: Remove mm_svc.h header
  spm-mm: Refactor spm_svc.h and its contents
  spm-mm: Refactor secure_partition.h and its contents
  spm: Remove SPM Alpha 1 prototype and support files
  Remove dependency between SPM_MM and ENABLE_SPM build flags