Public bug reported:

[Impact]
DMIC micmute LED on HP platforms doesn't work.

[Fix]
Add LED class support from HDA codec, so DMIC can use LEDS_TRIGGER_AUDIO to 
control micmute.

[Test]
After applying the fix, micmute LED can correctly indicate the status of 
micmute.

[Regression Potential]
Low. For now it only affects one platform, and it doesn't touch any core part 
of the subsystem.

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux-oem-5.6 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: Incomplete

** Affects: linux-oem-5.6 (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Groovy)
     Importance: Undecided
         Status: Incomplete

** Affects: linux-oem-5.6 (Ubuntu Groovy)
     Importance: Undecided
         Status: Invalid


** Tags: oem-priority originate-from-1866766 stella

** Also affects: linux-oem-5.6 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.6 (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-oem-5.6 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.6 (Ubuntu Groovy)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1876859

Title:
  Support DMIC micmute LED on HP platforms

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