ASoC: Intel: sof_sdw: Rename sof_sdw_max98373.c file to sof_sdw_maxim.c

ASoC: Intel: sof_sdw: Rename sof_sdw_max98373.c file to sof_sdw_maxim.c

This is needed to use the common implementation for other maxim
soundwire codecs

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Yong Zhi <yong.zhi@intel.com>
Signed-off-by: Uday M Bhat <uday.m.bhat@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230602202225.249209-25-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>