Merge changes from topic "rd1ae-upstream" into integration

* changes:
  docs(rd1ae): add RD-1 AE documentation
  feat(rd1ae): enabling Trusted Board Boot(TBB) for RD-1 AE
  feat(rd1ae): introduce BL31 for RD-1 AE platform
  feat(rd1ae): add device tree files
  feat(rd1ae): introduce Arm RD-1 AE platform
  build(bl2): enable check for bl2 base overflow assert
  feat(arm): add support for loading CONFIG from BL2