V4L/DVB (4614): Export symbol saa7134_tvaudio_setmute from saa7134 for saa7134-alsa

saa7134-alsa now unmutes/mutes the line when opening/closing the capture
device, and needs this symbol
Signed-off-by: NRicardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/saa7134/saa7134-tvaudio.c

@@ -1046,6 +1046,7 @@ int saa7134_tvaudio_do_scan(struct saa7134_dev *dev)
 }
 
 EXPORT_SYMBOL(saa_dsp_writel);
+EXPORT_SYMBOL(saa7134_tvaudio_setmute);
 
 /* ----------------------------------------------------------- */
 /*