ALSA: oxygen: remove oxygen_model::private_data field

The number of DACs can now be deduced from the dac_channels_mixer field,
so the private_data field is no longer needed.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/oxygen/oxygen.h

@@ -97,7 +97,6 @@ struct oxygen_model {
 	void (*dump_registers)(struct oxygen *chip,
 			       struct snd_info_buffer *buffer);
 	const unsigned int *dac_tlv;
-	unsigned long private_data;
 	size_t model_data_size;
 	unsigned int device_config;
 	u8 dac_channels_pcm;