Fix ordering of device & platform mounts in configuration actions
When I add a device mount on a parent platform and both have the very same start date, then I currently see the platform mount above the device mount. So the association is that the platform mount is more recent then the device mount - which doesn't make any sense regarding the logic that we need to mount the platform before we mount the device.
So in this case I would expect the device mount to be "more recent" - and so above the platform mount.
