Public bug reported:

[Impact]
Qualcomm WCN6856 doens't work.

[Fix]
Backport missing bits to make Wifi 5 work. Wifi 6 support is not in the
scope of this SRU.

[Test]
The system can connect to Wifi. Wifi still works after several rounds of
suspend/resume cycles. 

[Where problems could occur]
The change is limited to ath11k, which is also the only user of mhi bus,
so the scope of risk is limited. Let alone it never worked before, so
there's not much room to go wrong.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Confirmed

** Affects: linux-firmware (Ubuntu)
     Importance: Low
         Status: Confirmed

** Affects: linux-oem-5.14 (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Focal)
     Importance: Undecided
         Status: Won't Fix

** Affects: linux-firmware (Ubuntu Focal)
     Importance: Low
         Status: Confirmed

** Affects: linux-oem-5.14 (Ubuntu Focal)
     Importance: Low
         Status: Confirmed

** Affects: linux (Ubuntu Jammy)
     Importance: Low
         Status: Confirmed

** Affects: linux-firmware (Ubuntu Jammy)
     Importance: Low
         Status: Confirmed

** Affects: linux-oem-5.14 (Ubuntu Jammy)
     Importance: Undecided
         Status: Invalid

** Also affects: linux-oem-5.14 (Ubuntu)
   Importance: Undecided
       Status: New

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

** Also affects: linux-oem-5.14 (Ubuntu Jammy)
   Importance: Undecided
       Status: New

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

** Also affects: linux-oem-5.14 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Focal)
       Status: New => Won't Fix

** Changed in: linux (Ubuntu Jammy)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Jammy)
   Importance: Undecided => Low

** Changed in: linux-oem-5.14 (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: linux-oem-5.14 (Ubuntu Focal)
   Importance: Undecided => Low

** Changed in: linux-oem-5.14 (Ubuntu Jammy)
       Status: New => Invalid

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

** Changed in: linux-firmware (Ubuntu Focal)
       Status: New => Confirmed

** Changed in: linux-firmware (Ubuntu Jammy)
       Status: New => Confirmed

** Changed in: linux-firmware (Ubuntu Focal)
   Importance: Undecided => Low

** Changed in: linux-firmware (Ubuntu Jammy)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1955613

Title:
  Add basic Wifi support for Qualcomm WCN6856

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