(feat)n1sdp: add support for OP-TEE SPMC

These changes are to add support for loading and booting
OP-TEE as SPMC running at SEL1 for N1SDP platform.

Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
Change-Id: I0514db646d4868b6f0c56f1ea60495cb3f7364fd
4 files changed