ath10k-firmware: QCA4019 hw1.0: Add Meraki "underdog" specific BDFs

[Hal Martin]

Hi,

I am working on support for the Meraki "underdog" APs in OpenWrt. The
"underdog" APs appear to cover the models: Meraki MR20/GR10, and
MR70/GR60. These APs require
two special BDFs to get the Wi-Fi PHYs working. The bmi-board-
id='s are not currently present in linux-firmware, so Wi-Fi is
non-functional without them.

For the questions from the wiki page [1]:

* description for what hardware this is:

  - IPQ4029 based boards
  - one QCA40xx radio is used as 2.4GHz radio
  - one QCA40xx radio is used as 5GHz radio

* origin of the board file (did you create it yourself or where you
  downloaded)

  - the files were extracted from the MR20 running a Meraki firmware
released in late 2024

* ids to be used with the board file (ATH10K_BD_IE_BOARD_NAME in ath10k)

  - QCA4019 hw1.0

    + bus=ahb,bmi-chip-id=0,bmi-board-id=22,variant=Meraki-underdog.bin
      sha256sum:
      3b196ab4d5cf18ee194b2aafbdfb4b26b144c8f15875274168a4d721bcd6e313
    + bus=ahb,bmi-chip-id=0,bmi-board-id=23,variant=Meraki-underdog.bin
      sha256sum:
      ff5654adb55a6aa2ef6ba527090b551af62d5746b5cdc22f43d35b24827f6999

* attach the actual board file (board.bin)

  - The name of the files are equal to the id string in the board-2.bin
    (minus the ".bin")

Kind regards,
Hal Martin

[1] https://wireless.wiki.kernel.org/en/users/drivers/ath10k/boardfiles
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