feat(rd1ae): introduce BL31 for RD-1 AE platform

This commit introduces BL31 to the RD-1 AE platform. The RD-1 AE
platform incorporates an SCP for CPU power control.

Additinaly introducing the memory descriptor provides BL image
information that gets used by BL2 to load the images

Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Signed-off-by: Divin Raj <divin.raj@arm.com>
Change-Id: I035cbfd09f254aa47483ad35676f1cb3ffb661bd
5 files changed