New location engine does not send physical cell ID

[joelkoen]

LTE cell towers have a physical cell ID, but the new location engine doesn't make use of this when requesting /v1/geolocate.

This might be related to #2391, as Ichnaea may be returning a location for the cell tower's whole coverage area as it does not know which physical unit of the cell tower the client is connected to.

[joelkoen]

geoclue also doesn't send this when requesting a location estimate. IMO this should be sent for increased accuracy in certain situations, but it definitely shouldn't be required: beacondb#22

[mar-v-in]

This one should be fixed on master