gpio: misc: Pass correct license string to MODULE_LICENSE

The GPIO driver copyright boilerplate lacks the "or
later" verbiage regarding GPL compliant distribution. The MODULE_LICENSE
string should reflect the actual copyright license terms used.
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-104-dio-48e.c

@@ -436,4 +436,4 @@ module_exit(dio48e_exit);
 
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
 MODULE_DESCRIPTION("ACCES 104-DIO-48E GPIO driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");

drivers/gpio/gpio-104-idi-48.c

@@ -341,4 +341,4 @@ module_exit(idi_48_exit);
 
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
 MODULE_DESCRIPTION("ACCES 104-IDI-48 GPIO driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");

drivers/gpio/gpio-104-idio-16.c

@@ -317,4 +317,4 @@ module_exit(idio_16_exit);
 
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
 MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");

drivers/gpio/gpio-ws16c48.c

@@ -433,4 +433,4 @@ module_exit(ws16c48_exit);
 
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
 MODULE_DESCRIPTION("WinSystems WS16C48 GPIO driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");