[ALSA] oxygen: generalize DAC volume TLV handling

Add a pointer for DAC volume TLV data to the model structure so that the
model driver do not need to manually assign it in their control filter.

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 36f2f81..a71c6e0 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -100,6 +100,7 @@
 	void (*gpio_changed)(struct oxygen *chip);
 	void (*ac97_switch)(struct oxygen *chip,
 			    unsigned int reg, unsigned int mute);
+	const unsigned int *dac_tlv;
 	size_t model_data_size;
 	unsigned int pcm_dev_cfg;
 	u8 dac_channels;