Merge the PI enabling works from the branch

First round of PI enabling work:
1) PiPeiCis changes (CONST, EFI_PEI_FILE_HANDLE.. etc)
2) Make use of FirmwareVolume 2 protocol.
3) Verified for Nt32Pkg and real platform for S3.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3772 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/PeiPcdLib/PeiPcdLib.c

@@ -20,6 +20,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #include <Ppi/Pcd.h>
 
+#include <Library/PeiServicesLib.h>
 #include <Library/PcdLib.h>
 #include <Library/DebugLib.h>
 #include <Library/PeiServicesTablePointerLib.h>
@@ -41,19 +42,8 @@ GetPcdPpiPtr (
 {
   EFI_STATUS        Status;
   PCD_PPI           *PcdPpi;
-  EFI_PEI_SERVICES  **PeiServices;
-
-
-  PeiServices = GetPeiServicesTablePointer ();
-
-  Status = (**PeiServices).LocatePpi (
-                             PeiServices,
-                             &gPcdPpiGuid,
-                             0,
-                             NULL,
-                             (VOID **)&PcdPpi
-                             );
-
+  
+  Status = PeiServicesLocatePpi (&gPcdPpiGuid, 0, NULL, (VOID **)&PcdPpi);
   ASSERT_EFI_ERROR (Status);
 
   return PcdPpi;