ASoC: Intel: boards: create sof-maxim-common module

ASoC: Intel: boards: create sof-maxim-common module

sof_maxim_common.o is linked twice, move to a dedicated module.

Also clean-up interfaces to use a consistent 'max_98373' prefix for
all symbols.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20210505163705.305616-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>