mozilla: Submit cell tower with correct radio type

Currently cell tower is always submitted with "gsm" radio type even if it's actually 3G or 4G tower. From my testing, cell towers submitted with "gsm" type will not be used when querying a location with LTE tower.

This is problematic because new 3G/4G towers submitted by geoclue will not help to get a location, and potentially cause a wrong location to be returned if GSM tower with the same cell id exists.