ALSA: hda: hdmi - add Icelake support

This is just a port of the ASoC Icelake HDMI codec code to the legacy
HDA driver with some cleanups.

ASoC commit 019033c8:
  "ASoC: Intel: hdac_hdmi: add Icelake support"

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Cc: Bard liao <bard.liao@intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>