fixed DMA not be stopped issue when gBS->ExitBootServices called.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8058 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Universal/Network/SnpDxe/SnpDxe.inf

@@ -1,7 +1,7 @@
 #/** @file
 #    Component description file for SNP module.
 #
-# Copyright (c) 2006, Intel Corporation. <BR> 
+# Copyright (c) 2006 - 2009, Intel Corporation. <BR> 
 # 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 
@@ -65,6 +65,10 @@
   DebugLib
 
 
+[Guids]
+  gEfiEventExitBootServicesGuid                 ## CONSUMES
+
+
 [Protocols]
   gEfiPciIoProtocolGuid                         # PROTOCOL ALWAYS_CONSUMED
   gEfiSimpleNetworkProtocolGuid                 # PROTOCOL ALWAYS_CONSUMED