BL1: Make and store boot measurements

Adds measurement of the following BL1_2 and BL2 stages to BL1_1 and
BL1_2 respectively. Stores them in the shared boot data area with
metadata for retrieval at runtime.

Co-authored-by: David Vincze <david.vincze@arm.com>
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Change-Id: I29904dae8a17a9769132493b65bd6994a3d25446
8 files changed