[Patch][UC22] Add firmware files for Atheros bluetooth modules

[Sergio Costas]

BugLink: https://bugs.launchpad.net/ubuntu/+bug/2025054

When using the Ubuntu Core 22 kernel in an Asus Zenbook UX21, this error 
is shown in journalctl:

         usb 1-1-1: Direct firmware load for ar3k/AthrBT_0x01020200.dfu 
failed with error -2
         Bluetooth: Patch file not found ar3k/AthrBT_0x01020200.dfu
         Bluetooth: Loading patch file failed
         ath3k: probe of 1-1.1:1.0 failed with error -2

Also, the bluetooth module doesn't work. This is because the current 
PC-KERNEL snap used in Ubuntu Core/Ubuntu Core Desktop (UC22) lacks the 
Atheros AR3K firmware files, which means that devices with an Atheros 
Bluetooth device (like the specified Asus Zenbook UX21) won't be able to 
use it.

This patch adds the missing files.
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