[ALSA] oxygen: make the number of analog output configurable

Add a field to struct oxygen_model to allow model drivers for cards with
less than eight output channels.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/oxygen/oxygen.c b/sound/pci/oxygen/oxygen.c
index 4f809bd..60af3a7 100644
--- a/sound/pci/oxygen/oxygen.c
+++ b/sound/pci/oxygen/oxygen.c
@@ -350,6 +350,7 @@
 	.update_dac_volume = update_ak4396_volume,
 	.update_dac_mute = update_ak4396_mute,
 	.model_data_size = sizeof(struct generic_data),
+	.dac_channels = 8,
 	.used_channels = OXYGEN_CHANNEL_A |
 			 OXYGEN_CHANNEL_C |
 			 OXYGEN_CHANNEL_SPDIF |
@@ -372,6 +373,7 @@
 	.update_dac_volume = update_ak4396_volume,
 	.update_dac_mute = update_ak4396_mute,
 	.model_data_size = sizeof(struct generic_data),
+	.dac_channels = 8,
 	.used_channels = OXYGEN_CHANNEL_B |
 			 OXYGEN_CHANNEL_C |
 			 OXYGEN_CHANNEL_SPDIF |