Merge changes from topic "rd-v3-reset-to-bl31" into integration

* changes:
  feat(neoverse-rd): allow RESET_TO_BL31 for third gen platforms
  feat(arm): setup GPT in BL31 in RESET_TO_BL31 boot flow
  feat(neoverse-rd): enable RESET_TO_BL31 for RD-V3
  feat(neoverse-rd): add a routine to update NT_FW_CONFIG in BL31