MdePkg: 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>

MdePkg/Library/BaseLib/Arm/InternalSwitchStack.c

@@ -1,7 +1,7 @@
 /** @file
   SwitchStack() function for ARM.
 
-  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -39,7 +39,7 @@ InternalSwitchStackAsm (
   IN      VOID                      *NewStack
   );
 
-  
+
 /**
   Transfers control to a function starting with a new stack.