Revert "Add SNR and signal level for access_demux"

This reverts commit 7a15955a.
This was never actually used; it was inadequate for V4L.

Conflicts:
	include/vlc_demux.h

include/vlc_demux.h

@@ -160,8 +160,6 @@ enum demux_query_e
 
     DEMUX_CAN_SEEK,            /* arg1= bool*    can fail (assume false)*/
 
-    DEMUX_GET_SIGNAL,          /* arg1= double * arg2= double * can fail */
-
     /* Navigation */
     DEMUX_NAV_ACTIVATE,        /* res=can fail */
     DEMUX_NAV_UP,              /* res=can fail */

src/input/input.c

@@ -2250,18 +2250,6 @@ static void UpdateGenericFromDemux( input_thread_t *p_input )
         }
         p_demux->info.i_update &= ~INPUT_UPDATE_META;
     }
-    if( p_demux->info.i_update & INPUT_UPDATE_SIGNAL )
-    {
-        double quality;
-        double strength;
-
-        if( demux_Control( p_demux, DEMUX_GET_SIGNAL, &quality, &strength ) )
-            quality = strength = -1.;
-
-        input_SendEventSignal( p_input, quality, strength );
-
-        p_demux->info.i_update &= ~INPUT_UPDATE_SIGNAL;
-    }
 
     p_demux->info.i_update &= ~INPUT_UPDATE_SIZE;
 }