extcon: int3496: Convert to use SPDX identifier

Convert driver to use SPDX identifier.

While here, fix MODULE_LICENSE() string to be the same as license text states.

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-intel-int3496.c

···
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel INT3496 ACPI device extcon driver
  *
···
  *
  * Copyright (c) 2014, Intel Corporation.
  * Author: David Cohen <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 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/acpi.h>
···
 
 MODULE_AUTHOR("Hans de Goede <[e-mail]>");
 MODULE_DESCRIPTION("Intel INT3496 ACPI device extcon driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");