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/drivers/block/sata_dwc.h b/drivers/block/sata_dwc.h
index e4e4ab1..e2d9e0c 100644
--- a/drivers/block/sata_dwc.h
+++ b/drivers/block/sata_dwc.h
@@ -12,12 +12,7 @@
  *          Copyright 2006 Applied Micro Circuits Corporation
  *          COPYRIGHT (C) 2005  SYNOPSYS, INC.  ALL RIGHTS RESERVED
  *
- * 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+
  */
 /*
  * SATA support based on the chip canyonlands.