.azurepipelines: Add StandaloneMmPkg to CI matrix
Bugzilla: 3150 (https://bugzilla.tianocore.org/show_bug.cgi?id=3150)
Add StandaloneMmPkg to the Core CI matrix.
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>