[router] Fix core interfaces signatures
[router] Fix core interfaces signatures

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