plat/arm/css: Add SID registers for SGx platforms
Chandni Cherukuri authored
Some of the SGx platforms use System Identification (SID) registers
for platform identification. Add support for these registers in css.

Change-Id: If00b18744a31ff2cf14338f18c8c680eb69c9027
Signed-off-by: default avatarChandni Cherukuri <chandni.cherukuri@arm.com>
722236f2