[media] dvb_usb_v2: add .bInterfaceNumber match

There is no USB match flag for used USB interface. It is rather
common there is multiple interfaces offering different services.
For example one for television and one for remote controller.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/dvb/dvb-usb/dvb_usb.h b/drivers/media/dvb/dvb-usb/dvb_usb.h
index e67333b..4394a5d 100644
--- a/drivers/media/dvb/dvb-usb/dvb_usb.h
+++ b/drivers/media/dvb/dvb-usb/dvb_usb.h
@@ -172,6 +172,7 @@
 	const char *driver_name;
 	struct module *owner;
 	short *adapter_nr;
+	u8 bInterfaceNumber;
 
 	int size_of_priv;