NetworkPkg: Clean up source files

1. Do not use tab characters
2. No trailing white space in one line
3. All files must end with CRLF

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>

NetworkPkg/Mtftp6Dxe/Mtftp6Driver.c

@@ -2,7 +2,7 @@
   Driver Binding functions and Service Binding functions
   implementation for Mtftp6 Driver.
 
-  Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
 
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -238,7 +238,7 @@ Mtftp6CreateInstance (
 
 /**
   Callback function which provided by user to remove one node in NetDestroyLinkList process.
-  
+
   @param[in]    Entry           The entry to be removed.
   @param[in]    Context         Pointer to the callback context corresponds to the Context in NetDestroyLinkList.
 
@@ -473,7 +473,7 @@ Mtftp6DriverBindingStop (
   EFI_STATUS                                 Status;
   LIST_ENTRY                                 *List;
   MTFTP6_DESTROY_CHILD_IN_HANDLE_BUF_CONTEXT Context;
-  
+
   //
   // Locate the Nic handle to retrieve the Mtftp6 private data.
   //