[media] dvb-usb-dibusb-mc-common: Add MODULE_LICENSE

dvb-usb-dibusb-mc-common is licensed under GPLv2, and if we don't say
so then it won't even load since it needs a GPL-only symbol.

Fixes: e91455a1495a ("[media] dvb-usb: split out common parts of dibusb")

Reported-by: Dominique Dumont <dod@debian.org>
Cc: stable@vger.kernel.org # 4.9+
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/dvb-usb/dibusb-mc-common.c

@@ -11,6 +11,8 @@
 
 #include "dibusb.h"
 
+MODULE_LICENSE("GPL");
+
 /* 3000MC/P stuff */
 // Config Adjacent channels  Perf -cal22
 static struct dibx000_agc_config dib3000p_mt2060_agc_config = {