staging: board: Replace license boilerplate with SPDX identifiers

This satisfies a checkpatch.pl warning and is the preferred method for
notating the license due to its lack of ambiguity.

Signed-off-by: Nathan Chancellor <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/board/armadillo800eva.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Staging board support for Armadillo 800 eva.
  * Enable not-yet-DT-capable devices here.
···
  *
  * Copyright (C) 2012 Renesas Solutions Corp.
  * Copyright (C) 2012 Kuninori Morimoto <[e-mail]>
- *
- * 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; version 2 of the License.
- *
- * 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.
  */
 
 #include <linux/dma-mapping.h>

drivers/staging/board/board.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2014 Magnus Damm
  * Copyright (C) 2015 Glider bvba
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
  */
 
 #define pr_fmt(fmt)	"board_staging: "  fmt