ASoC: intel/skl/hda - add no-HDMI cases to generic HDA driver

Extend the generic HDA driver to support systems where iDisp/HDMI
audio codecs are disabled for some reason. Switch codecs to
SoC dummy in the affected DAI links. This allows to reuse
existing topologies for this case.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206085
BugLink: https://bugzilla.opensuse.org/show_bug.cgi?id=1163677
BugLink: https://github.com/thesofproject/linux/issues/1658
Link: https://lore.kernel.org/r/20200220171028.22023-2-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>