ASoC: SOF: Intel: hda: add namespace for hda-codec functionality

Define namespaces (one generic and one dedicated for i915) and include
them in HDaudio top-level module.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191217202231.18259-7-pierre-louis.bossart@linux.intel.com


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