feat(ras): add RAS system registers access test

FEAT_RAS introduces EL1 system registers to query error records, those
CPU specific parts of the RAS extension can be accessed independently of
any FFH/KFH handling setup or any system specific RAS implementation.

Add a test to verify that those registers can be read, when the CPUID
field advertises the MPAM (CPU) extension.

Change-Id: I7429fc815e7e0ee0cd736603966969b2cfb5f469
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
4 files changed