Wifi latency optimization

Hello,

maybe Turris should implement some latency tweaks found in openwrt forums. AQL tuning as well.

Tried in my omnia, only these commands do not work:

iw phy0 set codel target 5
iw phy0 set codel interval 50

Maybe we need a custom iw binary?
Anyway, after all these changes wifi still works stable. Didn’t do any traffic/latency test to confirm their validity.