sof-hda-dsp: fix path to Hdmi.conf

alsa-project/alsa-ucm-conf pull request #127 was opened from sustmi:

Fixes https://github.com/alsa-project/alsa-ucm-conf/issues/126 .

Request URL : https://github.com/alsa-project/alsa-ucm-conf/pull/127 Patch URL : https://github.com/alsa-project/alsa-ucm-conf/pull/127.patch Repository URL: https://github.com/alsa-project/alsa-ucm-conf