ASoC: Intel: sof_sdw: remove unused function declaration

The functions sof_sdw_rt712_sdca_init() and sof_sdw_rt712_sdca_exit()
declared in header file are never implemented and used, remove them.
Signed-off-by: Chao Song <chao.song@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20231127133448.18449-3-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_sdw_common.h

@@ -138,12 +138,6 @@ int sof_sdw_rt_sdca_jack_init(struct snd_soc_card *card,
 int sof_sdw_rt_sdca_jack_exit(struct snd_soc_card *card, struct snd_soc_dai_link *dai_link);
 
 /* RT712-SDCA support */
-int sof_sdw_rt712_sdca_init(struct snd_soc_card *card,
-			    const struct snd_soc_acpi_link_adr *link,
-			    struct snd_soc_dai_link *dai_links,
-			    struct sof_sdw_codec_info *info,
-			    bool playback);
-int sof_sdw_rt712_sdca_exit(struct snd_soc_card *card, struct snd_soc_dai_link *dai_link);
 int sof_sdw_rt712_spk_init(struct snd_soc_card *card,
 			   const struct snd_soc_acpi_link_adr *link,
 			   struct snd_soc_dai_link *dai_links,