feat(coverity): add SPMC_AT_EL3=1 and MEASURED_BOOT=1 build for juno

Enable building the EL3_SPMC and MEASURED_BOOT as part of the coverity
scan for juno.

This is triggered by the patch series here:
  - https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/39825

Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Change-Id: Id70dcf245f085b1e6ce85664e842fb1a5c82aa47
1 file changed