[TEMP][EINJ-CMN]feat(einj): Extends ARM SIP for Platform specific firmware-first error injection

Extends ARM SIP(Silicon Provider Service) for Firmware-first
error injection from kernel.This enables platforms to
register error injection handlers with the framework.

Signed-off-by: Glen Yeldho <glen.yeldho@arm.com>
Change-Id: Iac4e0deae2d49e3b0deb6e9f75e3a288d572f620