of: Use SPDX license tag for DT files

Convert remaining DT files to use SPDX-License-Identifier tags.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Rob Herring <robh@kernel.org>

include/linux/of.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
 #ifndef _LINUX_OF_H
 #define _LINUX_OF_H
 /*
@@ -9,11 +10,6 @@
  * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
  * Updates for SPARC64 by David S. Miller
  * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
- *
- * 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.
  */
 #include <linux/types.h>
 #include <linux/bitops.h>