Update Turbulence on noiseSource change
Update Turbulence on noiseSource change

Change-Id: Ib730bcad0a345df8e4cd45aa5b8ab892d3de16f7
Reviewed-on: http://codereview.qt-project.org/4860
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Martin Jones <d1da02505c7f228af82a23235becb435f45569f5@nokia.com>

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