[router] Move method for consistency between files
[router] Move method for consistency between files

TheThingsNetwork/ttn,jvanmalder/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,mgranberry/ttn,LoRaWanSoFa/ttn,TheThingsNetwork/ttn,mgranberry/ttn,mgranberry/ttn