[media] dvb: don't keep support for undocumented features

There are two DVB demux callbacks and ioctls that aren't documented
and aren't used at all by the DVB core or by any DVB driver upstream.

Let's comment out the code for those two ioctls and remove on some
future version.
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-core/demux.h

@@ -411,10 +411,12 @@ struct dmx_demux {
 
 	int (*get_pes_pids) (struct dmx_demux* demux, u16 *pids);
 
+	/* private: Not used upstream and never documented */
+#if 0
 	int (*get_caps) (struct dmx_demux* demux, struct dmx_caps *caps);
-
 	int (*set_source) (struct dmx_demux* demux, const dmx_source_t *src);
-
+#endif
+	/* public: */
 	int (*get_stc) (struct dmx_demux* demux, unsigned int num,
 			u64 *stc, unsigned int *base);
 };

drivers/media/dvb-core/dmxdev.c

@@ -1023,6 +1023,9 @@ static int dvb_demux_do_ioctl(struct file *file,
 		dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
 		break;
 
+#if 0
+	/* Not used upstream and never documented */
+
 	case DMX_GET_CAPS:
 		if (!dmxdev->demux->get_caps) {
 			ret = -EINVAL;
@@ -1038,6 +1041,7 @@ static int dvb_demux_do_ioctl(struct file *file,
 		}
 		ret = dmxdev->demux->set_source(dmxdev->demux, parg);
 		break;
+#endif
 
 	case DMX_GET_STC:
 		if (!dmxdev->demux->get_stc) {