feat(morello): expose scmi protocols in fdts

Add 'firmware' node in morello-soc.dts to expose SCMI
support to the kernel. The SCMI protocols supported at
the moment are SCMI Base, Clock and Perf (DVFS).

The current mailbox memory region in MHU SRAM has an issue
with any access not aligned to a 4-byte boundary. So, the SCMI
mailbox memory region has been relocated to AP non-trusted
RAM to get around the problem.

Signed-off-by: Anurag Koul <anurag.koul@arm.com>
Change-Id: Ibcbce8823b751a0fc3be7e9bc3588c1dc47ae024
2 files changed