IntelFsp2Pkg: BaseFspCommonLib Support for X64

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3867
Add BaseFspCommonLib Support for X64.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Ashraf Ali S <ashraf.ali.s@intel.com>
Signed-off-by: Ted Kuo <ted.kuo@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>

IntelFsp2Pkg/FspSecCore/SecFsp.c

@@ -217,7 +217,7 @@ FspGlobalDataInit (
 **/
 VOID
 FspDataPointerFixUp (
-  IN UINT32  OffsetGap
+  IN UINTN  OffsetGap
   )
 {
   FSP_GLOBAL_DATA  *NewFspData;