feat(handoff): add 32-bit variant of SRAM layout

Introduce the 32-bit variant of the SRAM layout used by BL1 to
communicate available free SRAM to BL2. This layout was added to the
specification in:
https://github.com/FirmwareHandoff/firmware_handoff/pull/54.

Change-Id: I559fb8a00725eaedf01856af42d73029802aa095
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
1 file changed