feat(coverity/el3_spmc): enable support for EL3 SPMC

Enable building the EL3 SPMC as part of the coverity scan. This
exercises the SPMC_AT_EL3 build flag.

Signed-off-by: Marc Bonnici <marc.bonnici@arm.com>
Change-Id: Ia10697fa902dcd2d657a080e6de562b748d40d6c
1 file changed