ASoC: Intel: boards: support Elkhart Lake with rt5660

ASoC: Intel: boards: support Elkhart Lake with rt5660

This patch adds the support of Intel Elkhart Lake with
Realtek rt5660 codec.

Signed-off-by: Libin Yang <libin.yang@linux.intel.com>
Signed-off-by: Muhammad Nazif Bin Mohd Borhan <muhammad.nazif.mohd.borhan@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200409185827.16255-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>