Add UCM for RME Fireface UCX

[GitHub pull_request - opened <github@xxxxxxxxxxxxxxxx>]

alsa-project/alsa-ucm-conf pull request #606 was opened from vascosantos:

Adds UCM for RME Fireface UCX (heavily based on RME Fireface UCX II config).
Device is assumed in CC mode.
#605

Request URL   : https://github.com/alsa-project/alsa-ucm-conf/pull/606
Patch URL     : https://github.com/alsa-project/alsa-ucm-conf/pull/606.patch
Repository URL: https://github.com/alsa-project/alsa-ucm-conf