platform/x86: intel_pmc: Convert to use SPDX identifier

Reduce size of duplicated comments by switching to use SPDX identifier.

No functional change.

While here, correct MODULE_LICENSE() string to be aligned with license text.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/intel_pmc_core.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel Core SoC Power Management Controller Driver
  *
@@ -6,16 +7,6 @@
  *
  * Authors: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
  *          Vishwanath Somayaji <vishwanath.somayaji@intel.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

drivers/platform/x86/intel_pmc_core.h

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel Core SoC Power Management Controller Header File
  *
@@ -6,16 +7,6 @@
  *
  * Authors: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com>
  *          Vishwanath Somayaji <vishwanath.somayaji@intel.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
  */
 
 #ifndef PMC_CORE_H

drivers/platform/x86/intel_pmc_ipc.c

+// SPDX-License-Identifier: GPL-2.0
 /*
- * intel_pmc_ipc.c: Driver for the Intel PMC IPC mechanism
+ * Driver for the Intel PMC IPC mechanism
  *
  * (C) Copyright 2014-2015 Intel Corporation
  *
- * This driver is based on Intel SCU IPC driver(intel_scu_opc.c) by
+ * This driver is based on Intel SCU IPC driver(intel_scu_ipc.c) by
  *     Sreedhara DS <sreedhara.ds@intel.com>
  *
- * 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.
- *
  * PMC running in ARC processor communicates with other entity running in IA
  * core through IPC mechanism which in turn messaging between IA core ad PMC.
  */
@@ -1028,7 +1024,7 @@ static void __exit intel_pmc_ipc_exit(void)
 
 MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
 MODULE_DESCRIPTION("Intel PMC IPC driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 
 /* Some modules are dependent on this, so init earlier */
 fs_initcall(intel_pmc_ipc_init);