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@3773 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Core/DxeIplPeim/DxeLoad.c

@@ -377,8 +377,8 @@ Returns:
 
     Status = PeiServicesFfsFindNextFile (
                Type,
-               FwVolHeader,
-               &FfsFileHeader
+               (EFI_PEI_FV_HANDLE)    FwVolHeader,
+               (EFI_PEI_FILE_HANDLE*) &FfsFileHeader
                );
     if (!EFI_ERROR (Status)) {
       Status = PeiProcessFile (