Stack_seal_mitigation: Secure harden the Main Stack Pointer (MSP)

Seal the MSP_S for both IPC mode and Library mode with the recommended
stack seal value during runtime. Check the comments in the header
file for more details.

Change-Id: Icc36f318d5416aa2c3df8b4d647d892caddd20c3
Signed-off-by: Ken Liu <ken.liu@arm.com>
7 files changed