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/MemoryTest/BaseMemoryTestPei/BaseMemoryTest.c

@@ -20,6 +20,7 @@ Abstract:
 --*/
 
 #include <BaseMemoryTest.h>
+#include <Library/PeiServicesLib.h>
 
 static PEI_BASE_MEMORY_TEST_PPI mPeiBaseMemoryTestPpi = { BaseMemoryTest };
 
@@ -51,11 +52,9 @@ Returns:
 
 --*/  
 {
-  EFI_STATUS  Status;
 
-  Status = (**PeiServices).InstallPpi (PeiServices, &PpiListPeiBaseMemoryTest);
-
-  return Status;
+  return PeiServicesInstallPpi (&PpiListPeiBaseMemoryTest);
+  
 }
 
 EFI_STATUS