First off, thanks to everyone who has responded to this. Hopefully a new version of Collector will have these fields enabled.
Data exported from ArcGIS Online (AGOL) as a file geodatabase and opened in ArcMap will show latitude and longitude location of points when they are queried using the Identify tool. However there is no location data in the attribute table associated with the data. If lat/long data is needed I found that exporting the points from ArcMap as a shapefile, adding fields for lat & long to the shapefile attribute table and using calculate geometry to populate the cells with lat and long values worked. This attribute table can then be joined to the attribute table associated with the original file geodatabase to append lat/long cells to each of the points in the table.
As far as I have seen it is not possible to simply add fields and calculate geometry directly to the file geodatabase attribute table. You can add fields, but the calculate geometry function is grayed out.
Dave