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/BaseMemoryLibRepStr/Ia32/ScanMem64.S

@@ -1,6 +1,6 @@
 #------------------------------------------------------------------------------
 #
-# 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
@@ -58,6 +58,6 @@ L1:
     leal    -8(%edi), %eax
     jz      L2
     movl    %ecx, %eax
-L2:    
+L2:
     pop     %edi
     ret