[media] ddbridge: Avoid duplicated symbol definition

drivers/media/dvb/ddbridge/built-in.o: In function `my_dvb_dmx_ts_card_init':
/home/v4l/v4l/patchwork/drivers/media/dvb/ddbridge/ddbridge-core.c:718: multiple definition of `my_dvb_dmx_ts_card_init'
drivers/media/dvb/ngene/built-in.o:/home/v4l/v4l/patchwork/drivers/media/dvb/ngene/ngene-dvb.c:227: first defined here
drivers/media/dvb/ddbridge/built-in.o: In function `my_dvb_dmxdev_ts_card_init':
/home/v4l/v4l/patchwork/drivers/media/dvb/ddbridge/ddbridge-core.c:737: multiple definition of `my_dvb_dmxdev_ts_card_init'
drivers/media/dvb/ngene/built-in.o:/home/v4l/v4l/patchwork/drivers/media/dvb/ngene/ngene-dvb.c:246: first defined here
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/ddbridge/ddbridge-core.c

@@ -711,7 +711,7 @@ static int tuner_attach_stv6110(struct ddb_input *input, int type)
 	return 0;
 }
 
-int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
+static int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
 			    int (*start_feed)(struct dvb_demux_feed *),
 			    int (*stop_feed)(struct dvb_demux_feed *),
 			    void *priv)
@@ -729,7 +729,7 @@ int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
 	return dvb_dmx_init(dvbdemux);
 }
 
-int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
+static int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
 			       struct dvb_demux *dvbdemux,
 			       struct dmx_frontend *hw_frontend,
 			       struct dmx_frontend *mem_frontend,