SpiFvbServiceStandaloneMm: Add changes for rewrite varstore header

Updates the Standalone MM module to have the necessary INF changes
to build with the following two recent commits made to rewrite the
the variable store header in the MM SPI FVB service.

  - e95c7988
  - 88d44c56

Cc: Ashraf Ali S <ashraf.ali.s@intel.com>
Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Isaac Oram <isaac.w.oram@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>