libwifi: add station expected throughput
Add station estimated throughput for both cases when:
- we are backhaul station
- for station connected to AP
Perfectly if we can get this info directly from the driver. In other case we could estimate this base on different factors like stats from rate control, histograms, rssi ...
Signed-off-by: Janusz Dziedzic janusz.dziedzic@iopsys.eu