Revert: ath: add support for special 0x0 regulatory domain

[Kalle Valo]

Brian Norris <briannorris at chromium.org> writes:

> Side note: it's a small shame that Kalle's scripts seem to have munged
> the authorship date -- git thinks it was authored in 2022, when in
> fact it was in 2020 ;)

Oops, sorry about that. I use stgit and then I edited the commit log to
add the Link tag, it must have changed the date.

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