Add 4 APIs to DevicePathLib: ConvertDeviceNodeToText, ConvertDevicePathToText, ConvertTextToDeviceNode and ConvertTextToDevicePath.
Add a new instance of DevicePathLib which tries to locate the protocol and if it's not found, it uses the internal functions.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14504 6f19259b-4bc3-4df7-8a09-765794883524
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 0fd6fcb..092a67d 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -1,7 +1,7 @@
 ## @file

 # EFI/PI MdePkg Package

 #

-# Copyright (c) 2007 - 2011, Intel Corporation. All rights reserved.<BR>

+# Copyright (c) 2007 - 2013, Intel Corporation. All rights reserved.<BR>

 # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>

 #

 #    This program and the accompanying materials

@@ -113,6 +113,7 @@
   MdePkg/Library/UefiDebugLibConOut/UefiDebugLibConOut.inf

   MdePkg/Library/UefiDebugLibStdErr/UefiDebugLibStdErr.inf

   MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf

+  MdePkg/Library/UefiDevicePathLib/UefiDevicePathLibOptionalDevicePathProtocol.inf

   MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLibDevicePathProtocol.inf

   MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf

   MdePkg/Library/UefiLib/UefiLib.inf