ASoC: remove codec hw_write/control_data

No one is using codec hw_write/control_data any more.
Let's remove these.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc.h

@@ -932,8 +932,6 @@ struct snd_soc_codec {
 	unsigned int cache_init:1; /* codec cache has been initialized */
 
 	/* codec IO */
-	void *control_data; /* codec control (i2c/3wire) data */
-	hw_write_t hw_write;
 	void *reg_cache;
 
 	/* component */