include/linux/mtd: Update copyright notices

Condense these updates down to SPDX tags too while doing this.  This is
a port of a1452a3771c4eb85bd779790b040efdc36f4274e from the Linux
Kernel.

Signed-off-by: Tom Rini <trini@konsulko.com>

include/linux/mtd/concat.h

@@ -1,9 +1,10 @@
 /*
  * MTD device concatenation layer definitions
  *
- * (C) 2002 Robert Kaiser <rkaiser@sysgo.de>
+ * Copyright © 2002      Robert Kaiser <rkaiser@sysgo.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
  *
- * This code is GPL
  */
 
 #ifndef MTD_CONCAT_H

include/linux/mtd/doc2000.h

@@ -1,12 +1,13 @@
 /*
  * Linux driver for Disk-On-Chip devices
  *
- * Copyright (C) 1999 Machine Vision Holdings, Inc.
- * Copyright (C) 2001-2003 David Woodhouse <dwmw2@infradead.org>
- * Copyright (C) 2002-2003 Greg Ungerer <gerg@snapgear.com>
- * Copyright (C) 2002-2003 SnapGear Inc
+ * Copyright © 1999 Machine Vision Holdings, Inc.
+ * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
+ * Copyright © 2002-2003 Greg Ungerer <gerg@snapgear.com>
+ * Copyright © 2002-2003 SnapGear Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
  *
- * Released under GPL
  */
 
 #ifndef __MTD_DOC2000_H__

include/linux/mtd/mtd.h

@@ -1,7 +1,7 @@
 /*
  * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
  *
- * Released under GPL
+ * SPDX-License-Identifier:	GPL-2.0+
  *
  */
 

include/linux/mtd/nand_ecc.h

@@ -1,11 +1,11 @@
 /*
  *  drivers/mtd/nand_ecc.h
  *
- *  Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
+ *  Copyright (C) 2000-2010 Steven J. Hill <sjhill@realitydiluted.com>
+ *			    David Woodhouse <dwmw2@infradead.org>
+ *			    Thomas Gleixner <tglx@linutronix.de>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier:	GPL-2.0
  *
  * This file is the header for the ECC algorithm.
  */