[Bug 1932352] [NEW] Fix micmute hotkeys on HP Elite Dragonfly

[jeremyszu]

Public bug reported:

[Impact]
Mic mute key is no function on HP Elite Dragonfly.

[Fix]
After confirming with HP, there are two model names for Dragonfly:
* HP Elite Dragonfly G2 Notebook PC
* HP Elite Dragonfly Max Notebook PC
Thus, the commit 
Commit c1b8c966eccb7be1cae0a30670f5e1fcd88b47fa maps the 81 scan code to mic mute key.

[Test]
After patching it, the mic mute key could functioned well on my Dragonfly laptop.

[Where problems could occur]
There is not old rule for Dragonfly dmi string in current hwdb.
Which means the Dragonfly is using default HP key map:
```
evdev:atkbd:dmi:bvn*:bvr*:bd*:svnHP*:pn*:*                                                                
 KEYBOARD_KEY_81=fn_esc
```
This patch will change the HP machine (if product name contains pnHPEliteDragonfly*) to map 81 to mic mute key.
If a machine (pnHPEliteDragonfly*) works good in the past then this patch may cause it's mic mute key become malfunction.
However, this rule is confirmed/provided from HP.

** Affects: oem-priority
     Importance: Critical
     Assignee: jeremyszu (os369510)
         Status: Triaged

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: oem-priority originate-from-1930709 stella

** Tags added: oem-priority originate-from-1930709 stella

** Changed in: oem-priority
     Assignee: (unassigned) => jeremyszu (os369510)

** Changed in: oem-priority
   Importance: Undecided => Critical

** Changed in: oem-priority
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1932352

Title:
  Fix micmute hotkeys on HP Elite Dragonfly

Status in OEM Priority Project:
  Triaged
Status in systemd package in Ubuntu:
  New

Bug description:
  [Impact]
  Mic mute key is no function on HP Elite Dragonfly.

  [Fix]
  After confirming with HP, there are two model names for Dragonfly:
  * HP Elite Dragonfly G2 Notebook PC
  * HP Elite Dragonfly Max Notebook PC
  Thus, the commit 
  Commit c1b8c966eccb7be1cae0a30670f5e1fcd88b47fa maps the 81 scan code to mic mute key.

  [Test]
  After patching it, the mic mute key could functioned well on my Dragonfly laptop.

  [Where problems could occur]
  There is not old rule for Dragonfly dmi string in current hwdb.
  Which means the Dragonfly is using default HP key map:
  ```
  evdev:atkbd:dmi:bvn*:bvr*:bd*:svnHP*:pn*:*                                                                
   KEYBOARD_KEY_81=fn_esc
  ```
  This patch will change the HP machine (if product name contains pnHPEliteDragonfly*) to map 81 to mic mute key.
  If a machine (pnHPEliteDragonfly*) works good in the past then this patch may cause it's mic mute key become malfunction.
  However, this rule is confirmed/provided from HP.

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