UIO: uio_pdrv: fix license specification

Thanks to Magnus Damm for pointing that out.
Signed-off-by: NUwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Acked-by: NHans J. Koch <hjk@linutronix.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/uio/uio_pdrv.c

@@ -116,5 +116,5 @@ module_exit(uio_pdrv_exit);
 
 MODULE_AUTHOR("Uwe Kleine-Koenig");
 MODULE_DESCRIPTION("Userspace I/O platform driver");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:" DRIVER_NAME);