MdeModulePkg: 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>
Reviewed-by: Star Zeng <star.zeng@intel.com>

MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Driver.c

@@ -1,6 +1,6 @@
 /** @file
 
-Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 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
 which accompanies this distribution.  The full text of the license may be found at
@@ -355,7 +355,7 @@ ON_ERROR:
 
 /**
   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.
 
@@ -445,7 +445,7 @@ Dhcp4DriverBindingStop (
   if (!IsListEmpty (&DhcpSb->Children)) {
     //
     // Destroy all the children instances before destory the service.
-    //  
+    //
     List = &DhcpSb->Children;
     Status = NetDestroyLinkList (
                List,
@@ -481,7 +481,7 @@ Dhcp4DriverBindingStop (
       gDhcpControllerNameTable = NULL;
     }
     FreePool (DhcpSb);
-    
+
     Status = EFI_SUCCESS;
   }