feat(tc): port BL1-BL2 interface to firmware handoff framework

The firmware handoff framework, is a light weight mechanism for
sharing information between bootloader stages.
Adding support for this framework at the handoff boundary between
firmware stage BL1 and BL2 on TC.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: Iae13adbcdd6ebbdcc61d04e017655c6b8d715ea0
2 files changed