feat(rdv3): add carveout for BL32 image

Add and map the carveout for loading Hafnium as BL32 image. Also define
PLAT_ARM_SP_MAX_SIZE as 3 MB for secure partitions.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Signed-off-by: Nishant Sharma <nishant.sharma@arm.com>
Signed-off-by: Rakshit Goyal <rakshit.goyal@arm.com>
Change-Id: I2845eb6807a127c9f6b92de2dabc9a58d25bd4d4
5 files changed