ASoC: Intel: sof_sdw_max98373: change sof_sdw_mx8373_late_probe to static call

sof_sdw_mx8373_late_probe is only used in sof_sdw_max98373,
so it should be static and rename it to 'mx8373_sdw_late_probe'.

Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230419195524.46995-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>