[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/ens1370.c b/sound/pci/ens1370.c
index bc8272b..f06b95f 100644
--- a/sound/pci/ens1370.c
+++ b/sound/pci/ens1370.c
@@ -1446,7 +1446,7 @@
 static snd_kcontrol_new_t snd_es1371_mixer_spdif[] __devinitdata = {
 	ES1371_SPDIF(SNDRV_CTL_NAME_IEC958("",PLAYBACK,SWITCH)),
 	{
-		.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+		.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 		.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
 		.info =		snd_ens1373_spdif_info,
 		.get =		snd_ens1373_spdif_default_get,
@@ -1454,13 +1454,13 @@
 	},
 	{
 		.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),
 		.info =		snd_ens1373_spdif_info,
 		.get =		snd_ens1373_spdif_mask_get
 	},
 	{
-		.iface =	SNDRV_CTL_ELEM_IFACE_MIXER,
+		.iface =	SNDRV_CTL_ELEM_IFACE_PCM,
 		.name =		SNDRV_CTL_NAME_IEC958("",PLAYBACK,PCM_STREAM),
 		.info =		snd_ens1373_spdif_info,
 		.get =		snd_ens1373_spdif_stream_get,