[SRU][OEM-5.10] add support of MSO panel

[AaronMa]

[Impact]
New panel with MSO feature can't be light up.

[Fix]
This series enables eDP MSO on TGL+.
Patch set:
https://patchwork.freedesktop.org/series/86992/
https://patchwork.freedesktop.org/series/87536/
It depends on another patch set:
https://patchwork.freedesktop.org/series/83780/

[Test Case]
Verified on the target platform and other 2 laptops without MSO feature,
internal display good;
external monitor good;
external monitor good via dock;
no errors after GPU benchmark;

[Where problems could occur]
Intel GPU may lose the output.
Due to the concern of the big change, target to oem-5.10 only.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.10 - 5.10.0-1025.26

---------------
linux-oem-5.10 (5.10.0-1025.26) focal; urgency=medium

  * focal/linux-oem-5.10: 5.10.0-1025.26 -proposed tracker (LP: #1926155)

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * CirrusLogic: Cracking noises appears in built-in speaker when output volume
    is set >80% (LP: #1924997)
    - SAUCE: ALSA: hda/cirrus: Use CS8409 Equalizer to fix abnormal sounds on
      Bullseye

 -- Timo Aaltonen <email address hidden> Mon, 26 Apr 2021 16:18:11 +0300