feat(morello): add build config for Morello SoC

Added build config for Morello SoC platform.

Also, the coverity makefile has been updated and
clean_build performed to clean the build artifacts
before the build.

Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
Change-Id: I3427a0b343200d6f13ad6b08b5c997f6cf0ee002
3 files changed