Boot: Load image to SRAM for execution

Check the newest image's header for an SRAM load address, and if it
is present then copy the image to that address. This allows for faster
execution as well as the potential for larger images.

Signed-off-by: Oliver Swede <oli.swede@arm.com>
Change-Id: Ifbe868cb35d217086918ebeb5bb41690065b9f46
16 files changed