Port PlatformDriOverrideDxe into R9.

1. Add one OverrideVariableGuid in MdeModulePkg
2. Add one library PlatDriOverLib used by PlatformDriOverrideDxe.
3. Add PlatformDriOverrideDxe in MdeModulePkg

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4557 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/PlatformDriOverrideDxe/PlatformDriOverride.h

@@ -0,0 +1,58 @@
+/** @file
+
+Copyright (c) 2007, 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:
+
+    PlatformDriOverride.h
+
+Abstract:
+
+
+**/
+
+#ifndef PLATFORM_DRI_OVERRIDE_H_
+#define PLATFORM_DRI_OVERRIDE_H_
+
+#include <PiDxe.h>
+
+#include <Library/DebugLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/BaseLib.h>
+#include <Library/PlatDriOverLib.h>
+
+STATIC
+EFI_STATUS
+EFIAPI
+GetDriver (
+  IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL              * This,
+  IN     EFI_HANDLE                                     ControllerHandle,
+  IN OUT EFI_HANDLE                                     * DriverImageHandle
+  );
+
+STATIC
+EFI_STATUS
+EFIAPI
+GetDriverPath (
+  IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL              * This,
+  IN     EFI_HANDLE                                     ControllerHandle,
+  IN OUT EFI_DEVICE_PATH_PROTOCOL                       **DriverImagePath
+  );
+
+STATIC
+EFI_STATUS
+EFIAPI
+DriverLoaded (
+  IN EFI_PLATFORM_DRIVER_OVERRIDE_PROTOCOL          * This,
+  IN EFI_HANDLE                                     ControllerHandle,
+  IN EFI_DEVICE_PATH_PROTOCOL                       * DriverImagePath,
+  IN EFI_HANDLE                                     DriverImageHandle
+  );
+#endif