Import Library Class from original MDE package. Also I added the EFI_PEI_CORE_ENTRY_POINT definition in PiPeiCis.h.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2677 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/Library/PeiServicesTablePointerLib.h

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+/** @file
+  PEI Services Table Pointer Library services
+
+  Copyright (c) 2006, Intel Corporation
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  Module Name:  PeiServicesTablePointerLib.h
+
+**/
+
+#ifndef __PEI_SERVICES_TABLE_POINTER_LIB_H__
+#define __PEI_SERVICES_TABLE_POINTER_LIB_H__
+
+/**
+  The function returns the pointer to PEI services.
+
+  The function returns the pointer to PEI services.
+  It will ASSERT() if the pointer to PEI services is NULL.
+
+  @retval  The pointer to PeiServices.
+
+**/
+EFI_PEI_SERVICES **
+EFIAPI
+GetPeiServicesTablePointer (
+  VOID
+  );
+
+#endif
+