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/timll/devkit8000/devkit8000.h b/board/timll/devkit8000/devkit8000.h
index c1965e2..a7a37fe 100644
--- a/board/timll/devkit8000/devkit8000.h
+++ b/board/timll/devkit8000/devkit8000.h
@@ -5,23 +5,7 @@
  * (C) Copyright 2009
  * Frederik Kriewitz <frederik@kriewitz.eu>
  *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier:	GPL-2.0+
  */
 #ifndef _DEVKIT8000_H_
 #define _DEVKIT8000_H_