[RFC 1/2 RESEND] hostapd: add AFC client support

[Felix Fietkau]

On 13.02.24 12:15, Lorenzo Bianconi wrote:
> Introduce Automated Frequency Coordination (AFC) support for UNII-5 and
> UNII-7 6GHz bands.
> AFC is required for Standard Power Devices (SPDs) to determine a lists
> of channels and EIRP/PSD powers that are available in the 6GHz spectrum.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>

For OpenWrt, the extra curl dependency would be a significant 
inconvenience. I would strongly prefer moving the AFC server 
communication outside of hostapd and into a separate utility, which 
communicates with hostapd via control socket.
That way we could easily re-implement the http/json part with other 
components that are already part of the OpenWrt base system.

- Felix