rtc: ps3: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.
Reviewed-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-ps3.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * PS3 RTC Driver
  *
  * Copyright 2009 Sony Corporation
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.
- * If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <linux/kernel.h>