feat(rdaspen/ras): add DT buffer and IRQ setup

Added node to map reserved memory for CPER.
Interrupt set from TF-A for RAS error notification.

Change-Id: Id7e296772275cdf76c81d8d62294b0bce94bbf57
Signed-off-by: Sanjana Virupakshagouda <sanjana.virupakshagouda@arm.com>
5 files changed