ALSA: oxygen: allow different number of PCM and mixer channels

For cards like the Xonar HDAV1.3, differentiate between the number of
PCM channels that can be played and the number of channels whose volume
can be adjusted.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h
index b8fbc15..3d9535c 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -100,7 +100,8 @@
 	unsigned long private_data;
 	size_t model_data_size;
 	unsigned int device_config;
-	u8 dac_channels;
+	u8 dac_channels_pcm;
+	u8 dac_channels_mixer;
 	u8 dac_volume_min;
 	u8 dac_volume_max;
 	u8 misc_flags;