ASoC: max98090: Remove structure member extmic_mux from private data

There is no other use for extmic_mux than setting it to zero so remove it.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98090.c

@@ -2333,7 +2333,6 @@ static int max98090_probe(struct snd_soc_codec *codec)
 	max98090->lin_state = 0;
 	max98090->pa1en = 0;
 	max98090->pa2en = 0;
-	max98090->extmic_mux = 0;
 
 	ret = snd_soc_read(codec, M98090_REG_REVISION_ID);
 	if (ret < 0) {

sound/soc/codecs/max98090.h

@@ -1541,7 +1541,6 @@ struct max98090_priv {
 	u8 lin_state;
 	unsigned int pa1en;
 	unsigned int pa2en;
-	unsigned int extmic_mux;
 	unsigned int sidetone;
 	bool master;
 };