Ipq-wifi : how to add new device BDF for testing

While helping on supporting Netgear RAX120v2 I ran into an issue with rebasing @jewest code (based on OpenWrt master from Jan 18) to latest OpenWrt master.

Since January package/firmware/ipq-wifi switched to using the repo OpenWrt firmware/qca-wireless to pull in the BDFs.

Is there a mechanism to add a local BDF for testing/adding support a new device? Well, without having to modify package/firmware/ipq-wifi/Makefile that is.

Simply placing the BDF file into package/firmware/ipq-wifi didn't work.

Especially if one is going to create a PR does one have to create a PR request for the OpenWrt firmware/qca-wireless repo beforehand?