[PATCH] libertas: Add auto deep sleep support for SD8385/SD8686/SD8688

[Holger Schurig]

> iwconfig wlan0 power period 0   -> enable deep sleep (enter
> deep sleep immediately) 

> iwconfig wlan0 power period 5   -> enable auto deep sleep
> (enter deep sleep automatically after 5s idle time) 

> iwconfig wlan0 power period -1  -> disable deep sleep / auto
> deep sleep 

ACK from my side (not that I'm the maintainer ...)

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