[media] tuner-core: remove the legacy is_stereo() call

Nobody is using this legacy call. Just remove it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-core/dvb_frontend.h

@@ -239,7 +239,6 @@ struct analog_demod_ops {
 	void (*set_params)(struct dvb_frontend *fe,
 			   struct analog_parameters *params);
 	int  (*has_signal)(struct dvb_frontend *fe);
-	int  (*is_stereo)(struct dvb_frontend *fe);
 	int  (*get_afc)(struct dvb_frontend *fe);
 	void (*tuner_status)(struct dvb_frontend *fe);
 	void (*standby)(struct dvb_frontend *fe);

drivers/media/video/tuner-core.c

@@ -682,9 +682,6 @@ static void tuner_status(struct dvb_frontend *fe)
 	if (analog_ops->has_signal)
 		tuner_info("Signal strength: %d\n",
 			   analog_ops->has_signal(fe));
-	if (analog_ops->is_stereo)
-		tuner_info("Stereo:          %s\n",
-			   analog_ops->is_stereo(fe) ? "yes" : "no");
 }
 
 /* ---------------------------------------------------------------------- */
@@ -861,13 +858,6 @@ static int tuner_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 			(tuner_status & TUNER_STATUS_STEREO) ?
 			V4L2_TUNER_SUB_STEREO :
 			V4L2_TUNER_SUB_MONO;
-	} else {
-		if (analog_ops->is_stereo) {
-			vt->rxsubchans =
-				analog_ops->is_stereo(&t->fe) ?
-				V4L2_TUNER_SUB_STEREO :
-				V4L2_TUNER_SUB_MONO;
-		}
 	}
 	if (analog_ops->has_signal)
 		vt->signal = analog_ops->has_signal(&t->fe);