wireless-regdb: Allow 6ghz in the US

[Johannes Berg]

On Tue, 2025-09-09 at 14:12 +0800, Chen-Yu Tsai wrote:
> I wonder if it is worth bringing up this topic in the networking track
> at Plumbers this year?

I'm not sure who'd be there to discuss it with, I guess? I'm also not
sure who you'd even want to discuss it _with_, since it's mostly an
implementation detail and "just" needs to have something implemented, in
a creatively careful way not to break old stuff.

johannes