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/Universal/PcatSingleSegmentPciCfg2Pei/PciCfg2.c

@@ -364,7 +364,7 @@ PeimInitializePciCfg (
   ASSERT ((**PeiServices).Hdr.Revision >= PEI_SERVICES_REVISION);
 
   (**PeiServices).PciCfg = &gPciCfg2Ppi;
-  Status = (**PeiServices).InstallPpi (PeiServices, &gPciCfg2PpiList);
+  Status = (**PeiServices).InstallPpi ((CONST EFI_PEI_SERVICES **)PeiServices, &gPciCfg2PpiList);
 
   return Status;
 }