ASoC: Intel: Remove max98090 support for baytrail solution

byt-max98090 is deprecated in favor of cht-bsw-max98090 used by
sound/soc/intel/atom and SOF solutions both. Remove redundant machine
board and all related code.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@intel.com>
Link: https://lore.kernel.org/r/20201006064907.16277-3-cezary.rojewski@intel.com


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