Use Rx filters to facilitate frame processing on Host MCU side

[Suhoy95]

In the section 15 of programming guide there is described RX filter and exactly the function to receive only Beacon frame.

Preconfiguring that filter can optimized the load on MCU.

Tasks:

• run and test filtering
• function to switch in appropriate mode for passive scan
• function to return in regular station mode

[Suhoy95]

Function was testet with WireShark example.