Fix potential enum value clashes in QGeoPositionInfoSource::Error.

The declarative version of the position info source reuses the C++ enums.
Nevertheless the declarative version may add its own enums as well.
Shift the enum values such that C++ and QML version of the API can stay
in sync and at the same time add values independent from each other.

Change-Id: Ic7082a3d34e7a69f6518a3f1268ee319068bf15d
Reviewed-by: Anders Gunnarsson <anders.gunnarsson@appello.com>
Reviewed-by: Aaron McCarthy <mccarthy.aaron@gmail.com>
Update Positioning QML meta data following QML version bump to 5.2

Change-Id: I8170b591317feb866d208fa4c12a96d3ed52fb7a
Reviewed-by: Aaron McCarthy <mccarthy.aaron@gmail.com>