ASoC: Intel: maxim-common: support max98357a

Move max98357a code to this common module so it could be shared
between multiple SOF machine drivers.

Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210505163705.305616-12-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>