Mario UCM: Disable auto-mute and add AutoUnplugInputNode flag
Mario UCM: Disable auto-mute and add AutoUnplugInputNode flag

Remove 'PCM Playback Volume' control which does not exist.
Disable auto-mute to let Chrome will select the output device.
Also turn on AutoUnplugInputNode flag to display only the
active input device on UI.

BUG=chromium:267355
TEST=Manual test on x86-mario, gmerge adhd; select
output device in Chrome UI

Change-Id: I36d96fde5a3cfa285a2224743cff3817d80a59fa
Reviewed-on: https://gerrit.chromium.org/gerrit/66184
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>
Tested-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Reviewed-by: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>
Commit-Queue: Hsinyu Chao <8b91762bdbe27d3121b311091d7ca5125e9a8df6@chromium.org>

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