feat(cactus): add support for fake RAS handler command

This command mimics handling a RAS error delegated by an EL3 logical
secure partition through a direct message.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I45e728880de1ee594e980667872e663309c83c22
2 files changed