clocksource/drivers/sh_tmu: Convert to SPDX identifiers

This patch updates license to use SPDX-License-Identifier instead of verbose
license text.

Signed-off-by: Kuninori Morimoto <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>

drivers/clocksource/sh_tmu.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * SuperH Timer Support - TMU
  *
  *  Copyright (C) 2009 Magnus Damm
- *
- * 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
- *
- * 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/clk.h>