arm: socfpga: dts: altr,rst-mgr.h: Move to SPDX license identifiers

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Vince Bridgers <vbridger@altera.com>
Cc: Marek Vasut <marex@denx.de>
Acked-by: Pavel Machek <pavel@denx.de>

include/dt-bindings/reset/altr,rst-mgr.h

@@ -1,14 +1,7 @@
 /*
  * Copyright (c) 2014, Steffen Trumtrar <s.trumtrar@pengutronix.de>
  *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
+ * SPDX-License-Identifier:	GPL-2.0
  */
 
 #ifndef _DT_BINDINGS_RESET_ALTR_RST_MGR_H