ci: include .img files for archiving RMM in FIP

Update the collect_build_artefacts function to also
archive .img files when packaging RMM for FIP.

Change-Id: I126ba9a4e076b2dcfb6f18d7cc327d421f6811fc
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed