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: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: NKai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: NGuennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20210505163705.305616-7-pierre-louis.bossart@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>