Add GPL-2.0+ SPDX-License-Identifier to source files

Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/board/etin/kvme080/multiverse.h b/board/etin/kvme080/multiverse.h
index 776162d..b3b79b7 100644
--- a/board/etin/kvme080/multiverse.h
+++ b/board/etin/kvme080/multiverse.h
@@ -8,10 +8,7 @@
  *
  * Copyright 2005 ETIN SYSTEMS Co.,Ltd.
  *
- * This program is free software; you can redistribute	it and/or modify it
- * under  the terms of	the GNU General Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #ifndef __MULTIVERSE_H__