[ALSA] use PCM interface for IEC958 controls

Digigram VX core,ENS1370/1+ driver,CA0106 driver,EMU10K1/EMU10K2 driver
RME HDSP driver,RME9652 driver
For consistency, use the PCM interface instead of MIXER for IEC958
default/mask/stream mixer controls.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
diff --git a/sound/pci/emu10k1/emu10k1x.c b/sound/pci/emu10k1/emu10k1x.c
index e90c5ddd..52c7826 100644
--- a/sound/pci/emu10k1/emu10k1x.c
+++ b/sound/pci/emu10k1/emu10k1x.c
@@ -1183,7 +1183,7 @@
 static snd_kcontrol_new_t snd_emu10k1x_spdif_mask_control =
 {
 	.access =	SNDRV_CTL_ELEM_ACCESS_READ,
-	.iface =        SNDRV_CTL_ELEM_IFACE_MIXER,
+	.iface =        SNDRV_CTL_ELEM_IFACE_PCM,
 	.name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,MASK),
 	.count =	3,
 	.info =         snd_emu10k1x_spdif_info,
@@ -1192,7 +1192,7 @@
 
 static snd_kcontrol_new_t snd_emu10k1x_spdif_control =
 {
-	.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+	.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 	.name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 	.count =	3,
 	.info =         snd_emu10k1x_spdif_info,