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/Variable/Pei/PeiVariable.uni

@@ -3,13 +3,13 @@
 //
 // This module implements ReadOnly Variable Services required by PEIM and installs PEI ReadOnly Varaiable2 PPI.
 //
-// Copyright (c) 2006 - 2015, 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
 // 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.
 //