The ARM SMC Architecture functions were missing from ArmStdSmc.h. Add them, based on the SMC Calling Convention version 1.2 specification. Signed-off-by: Rebecca Cran <rebecca@nuviainc.com> Reviewed-by: Leif Lindholm <leif@nuviainc.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>