feat(fvp): port event log to firmware handoff

Support handing off the event log to both the secure and non-secure
worlds using the firmware handoff framework. This also needs us to
increase the maximum allocation for TB-FW configuration to accommodate
trusted boot entries.

Change-Id: I39d69d79434a366096dcf4fbdc5c434950170b78
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
3 files changed