[ALSA] oxygen: make the I2S format configurable

Add proper register bit symbols for the I2S format field, and allow card
models to configure the I2S format to be used for the DACs and ADCs.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h
index 602105c..98cccc6 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -86,6 +86,8 @@
 	void (*update_dac_mute)(struct oxygen *chip);
 	u8 used_channels;
 	u8 function_flags;
+	u16 dac_i2s_format;
+	u16 adc_i2s_format;
 };
 
 /* oxygen_lib.c */