ci: add build config for Live Firmware Activation

Introduces a CI build configuration to enable Live
Firmware Activation (LFA) testing.
Also adds LFA-supporting build command to the Coverity
script.

Change-Id: I78300aaf70e0dedaefad54c3e848235d55c0486b
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
5 files changed