Fix: utils-wifi-info for adapters with multiple wifi bands
Problem: UniFi nanoHD has two wifi adapters 1st supports 2g wifi 2nd supports 2g and 5g wifi
with the old util 2nd would over 2g from 1st adapter and no 5g would be available
Changes:
- populate variables $freq2 and $freq5 correctly if multiple frequency bands are supported
- only set 2g radio, if not set already
Tested with UniFi nanoHD von Max