Make Channel/Frequency dynamic

[genofire]

type AP (without hostapd restart):
Maybe per ubus possible:
https://github.com/openwrt/openwrt/blob/5dbac474269cb5720c9942772fd1983bf62249e0/package/network/services/hostapd/src/src/ap/ubus.c#L919

type ibss per iw:

https://github.com/openwrt/openwrt/blob/b3d8b3ab8e6fc0c0355f0680fc1c5f9c90a0c35a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh#L612-L616

type mesh per iw:

https://github.com/openwrt/openwrt/blob/b3d8b3ab8e6fc0c0355f0680fc1c5f9c90a0c35a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh#L659-L661