spm: use generated binary instead of prebuilt

Till now we were using prebuilt spm/hafnium binaries but as we are going
to track upstream repository its desirable to use generated binaries.

This patch gets hypervisor build artefacts from building spm/hafnium
tree and copying them to artefacts folder with "secure_" appended to
spm files.

Change-Id: I02e081e230dbe1e14dec03f59c7f83e8c78d485e
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
6 files changed