cmake: mod_scmi_perf

This change adds CMake build support for module/scmi_perf

Change-Id: If658c2ca74831140b92a28b412f20f28e4c2c74f
Signed-off-by: Chris Kay <chris.kay@arm.com>
Signed-off-by: Joel Goddard <joel.goddard@arm.com>
Signed-off-by: Girish Pathak <girish.pathak@arm.com>