ucm2: Add UCM support for Dell Desktop

[GitHub pull_request - opened]

alsa-project/alsa-ucm-conf pull request #120 was opened from shumingfan:

The Dell Desktop uses two USB audio codecs as front and rear panel.
The front UAC has two outputs of speaker/headphone and one input of headset mic.
The rear UAC has one output of line-out.

Signed-off-by: Shuming Fan <shumingf at realtek.com>

Request URL   : https://github.com/alsa-project/alsa-ucm-conf/pull/120
Patch URL     : https://github.com/alsa-project/alsa-ucm-conf/pull/120.patch
Repository URL: https://github.com/alsa-project/alsa-ucm-conf