ASoC: Intel: KMB: Add 8kHz audio support

Enable 8kHz audio support for Intel Keem Bay platform.

Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
Reviewed-by: Sia Jee Heng <jee.heng.sia@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200730055319.1522-2-michael.wei.hong.sit@intel.com


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