feat(fvp): add CCA CoT in DTB support

Adding support for CCA CoT in DTB. This makes it possible for BL2
to retrieve its chain of trust description from a configuration file
in DTB format. With this, the CoT description may be updated without
rebuilding BL2 image. This feature can be enabled by building BL2
with COT_DESC_IN_DTB=1 and COT=cca. The default behaviour remains to
embed the CoT description into BL2 image.

Change-Id: I5912aad5ae529281a93a76e6b8f4b89d867445fe
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
1 file changed