Merge changes from topic "mp/ras_refactoring" into integration

* changes:
  docs: document do_panic() and panic() helper functions
  fix(ras): restrict RAS support for NS world

diff --cc Makefile
Simple merge

diff --cc docs/getting_started/build-options.rst
Simple merge

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

diff --cc make_helpers/defaults.mk
Simple merge