Merge changes from topic "jc/mte_enable" into integration

* changes:
  Add documentation for CTX_INCLUDE_MTE_REGS
  Enable MTE support in both secure and non-secure worlds

diff --cc Makefile
Simple merge

diff --cc docs/getting_started/user-guide.rst
Simple merge

diff --cc include/arch/aarch64/arch.h
Simple merge

diff --cc make_helpers/defaults.mk
Simple merge