hwspinlock: qcom: Switch to SPDX license identifier

Use the appropriate SPDX license identifier in the Qualcomm Hwspinlock
driver source file and drop the previous boilerplate license text.

Signed-off-by: Suman Anna <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/hwspinlock/qcom_hwspinlock.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2013, The Linux Foundation. All rights reserved.
  * Copyright (c) 2015, Sony Mobile Communications AB
- *
- * 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.
  */
 
 #include <linux/hwspinlock.h>