ASoC: Intel: Add Skylake HDA platform driver

This patch starts to add the Skylake HDA platform driver by defining
SoC CPU dais, DMA driver ops and implements ALSA operations

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>