StandaloneMmCpu now can supports more architectures like RISC-V besides ARM/AARCH64. Signed-off-by: Tuan Phan <tphan@ventanamicro.com> Reviewed-by: levi.yun <yeoreum.yun@arm.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>