ALSA: virtuoso: fix Essence ST(X) S/PDIF input

On the Xonar Essence ST/STX, the connector J14 has been confirmed to be
a digital input, so enable it in the driver.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/oxygen/xonar_pcm179x.c

@@ -1074,6 +1074,7 @@ static const struct oxygen_model model_xonar_st = {
 	.device_config = PLAYBACK_0_TO_I2S |
 			 PLAYBACK_1_TO_SPDIF |
 			 CAPTURE_0_FROM_I2S_2 |
+			 CAPTURE_1_FROM_SPDIF |
 			 AC97_FMIC_SWITCH,
 	.dac_channels_pcm = 2,
 	.dac_channels_mixer = 2,