BlSupportSmm: fix definition of SetSmrr()

Cc: Guo Dong <guo.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Maurice Ma <maurice.ma@intel.com>
Cc: Benjamin You <benjamin.you@intel.com>
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-by: Guo Dong <guo.dong@intel.com>

UefiPayloadPkg/BlSupportSmm/BlSupportSmm.c

@@ -191,6 +191,7 @@ SmmFeatureLockOnS3 (
   @param[in] ProcedureArgument  Pointer to SMRR_BASE_MASK structure.
 **/
 VOID
+EFIAPI
 SetSmrr (
   IN VOID  *ProcedureArgument
   )