[ALSA] Add some more 'const', but needs changes in i2c/other/ak4*

Make data passed to ak4xxx_create 'const'.
Signed-of-by: Philipp Matthias Hahn <pmhahn@pmhahn.de>

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/sound/ak4xxx-adda.h

@@ -71,8 +71,8 @@ struct snd_akm4xxx {
 	} type;
 
 	/* (array) information of combined codecs */
-	struct snd_akm4xxx_dac_channel *dac_info;
-	struct snd_akm4xxx_adc_channel *adc_info;
+	const struct snd_akm4xxx_dac_channel *dac_info;
+	const struct snd_akm4xxx_adc_channel *adc_info;
 
 	struct snd_ak4xxx_ops ops;
 };