ASoC: Remove unused hw_write_t type

Commit 81da8a0b ("ASoC: remove codec hw_write/control_data") removed
use of hw_write_t in struct snd_soc_codec, but it left type definition.
Fully clean it up.

Fixes: 81da8a0b ("ASoC: remove codec hw_write/control_data")
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220610124420.4160986-1-amadeuszx.slawinski@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc.h

@@ -408,8 +408,6 @@ struct snd_soc_jack_pin;
 
 struct snd_soc_jack_gpio;
 
-typedef int (*hw_write_t)(void *,const char* ,int);
-
 enum snd_soc_pcm_subclass {
 	SND_SOC_PCM_CLASS_PCM	= 0,
 	SND_SOC_PCM_CLASS_BE	= 1,