sof-hda-dsp: make Headphone Playback Switch conditional

alsa-project/alsa-ucm-conf pull request #34 was opened from kv2019i:

The Headphone Playback Switch control is not present in all HDA codecs. Allow the Headphones definition to work also on such systems.

Signed-off-by: Kai Vehmanen kai.vehmanen@linux.intel.com

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/34 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/34.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf