I also have same problem. The steering, I think makes a slight Ghoon, Ghoon or Whoon sound while turning either side. But only makes it when the car is moving. I am unable to pinpoint whether it is the steering or the sound comes from wheels. I think it's the steering as it's quite clear inside.
While the car is stationary, there is no sound, only when it is moving. Can you record the sound? I will try also.
I readjusted the steering to see if there was something stuck but no change in behavior.