Bug#969897: wireless-regdb: Document differences between debian and upstream regulatory.db

[MichaIng <micha@dietpi.com>]

Package: wireless-regdb
Version: 2022.04.08-2~deb11u1

I just faced the same cfg80211 error, trying to switch from CRDA to the 
kernel builtin feature. It took me a while to find this bug report and 
about the need to switch to the upstream version of the database. Thanks 
for the pointer, and my fault to not read the README.

Would be great if the difference and reasons behind the Debian version 
of the database could be explained, as it seems to make things 
complicated and breaks using the WiFi adapter properly OOTB, especially 
in AP mode, when not using a Debian kernel. The kernel may not even have 
support for CRDA enabled, as it is usually seen deprecated or at least 
redundant.

Best regards,

Micha