QDeclarativeGeoMap::populateMap() currently considers only the
children() of the map when populating the map.
QQuickItems like the Repeater do not add the generated objects
among the QObject children, but only to the QQuickItem
childItems.
Therefore populateMap() should consider both lists together.

Task-number: QTBUG-52514
Change-Id: Ic919bc91c70242d6f5c4e67a63ff01482abed0ca
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>