feat(plat/arm): add FWU support in Arm platforms

Added firmware update support in Arm platforms by using
FWU platform hooks and compiling FWU driver in BL2
component.

Change-Id: I71af06c09d95c2c58e3fd766c4a61c5652637151
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
5 files changed