feat(tc): port BL31-BL33 interface to firmware handoff framework

Adding support for this framework at the handoff boundary between
firmware stage BL31 and BL33 on TC.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: Ia6cd29c8b6cdda0a127a3bac02f6fa1dcfc07151
3 files changed