If I'm looking at the right thing, the ax25 patches don't appear here, and this stable version is what I think Raspbian is running.? Let me know if you learn otherwise, and where you found it.
Go down to line 62 and it doesn't match what I believe we both understand is the patched version.
What release did you pull from raspberryPi git?
I ran this
git clone --depth=1 --branch rpi-6.1.y https://github.com/raspberrypi/linux
