configs/infra: enable firmware-first error handling support

The build flag 'EDK2_ENABLE_RAS' is does not provide the flexibility to
choose the components a platforms needs to provide firmware-first error
handling. So introduce additional build macros and use those macros on
platforms that require it.

Signed-off-by: Omkar Anand Kulkarni <omkar.kulkarni@arm.com>
Change-Id: I840c164b1a497a8cff0b629ca92901b05e6b6912