[Bug 1895669] [NEW] Add more support to Lenovo ThinkStation P620

[Launchpad Bug Tracker]

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[Impact]
After upgrading the audio device firmware and doing more testing, we found some new audio issue on Lenovo P620:
1) Rear mic doesn't work.
2) Front and rear mic/line-in don't use hardware gain to control capture volume.

[Fix]
For 1), add proper PCM stream assignment to the rear microphone.
For 2), add MixerElem to let alsa-lib and PulseAudio to pick correct mixer to change HW gain.

[Test]
With the new UCM applied, rear mic starts to work, and PulseAudio can control the hardware gain.

[Regression Potential]
The system hasn't hit the market so there's no chance to regression any system in the wild.

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: alsa-ucm-conf (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: alsa-ucm-conf (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: alsa-ucm-conf (Ubuntu Groovy)
     Importance: Undecided
         Status: New


** Tags: oem-priority originate-from-1893892 patch sutton
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Add more support to Lenovo ThinkStation P620
https://bugs.launchpad.net/bugs/1895669
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