Take a look at the "Enabling and Disabling Double Click Zoom" example on the HERE Maps Community pages.
Assuming you already have a map with the standard nokia.maps.map.component.Behavior component, you will get a nokia.maps.map.DoubleClick
component loaded by default.
To enable DoubleClick (if you haven't loaded behavior)
map.addComponent(new nokia.maps.map.component.zoom.DoubleClick());
To disable DoubleClick
map.removeComponent(map.getComponentById("zoom.DoubleClick"));