serial/8250_gsc.c: add MODULE_LICENSE

This patch adds the missing MODULE_LICENSE("GPL").
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/serial/8250_gsc.c

@@ -119,3 +119,5 @@ int __init probe_serial_gsc(void)
 }
 
 module_init(probe_serial_gsc);
+
+MODULE_LICENSE("GPL");