ASoC: Intel: cht_bsw_max98090: Fix I2S config + unused code

This driver probably never worked, the slots are configured
for 2ch 16 bit and the SSP2 as 24 bits, the cpu_dai configured as
LEFT_J and the codec_dai as I2S.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>