Merge changes from topic "RAS_REFACTORING" into integration
* changes:
feat(board/rdn2): enable base element RAM RAS support on RD-N2 platform
feat(plat/arm): add memory map entry for CPER memory region
feat(plat/arm): firmware first error handling support for base RAMs
feat(plat/arm): update common platform RAS implementation
feat(plat/sgi): remove RAS setup call from common code
refactor(plat/sgi): deprecate DMC-620 RAS support
fix(plat/common): register PLAT_SP_PRI only if not already registered
fix(plat/sgi): update PLAT_SP_PRI macro definition
fix(plat/arm): add RAS_FFH_SUPPORT check for RAS EHF priority