Add support for GPU clock controller and move corresponding
gdsc's from dummy to real on Kera platform.
While at it, add the clocks property to camera and display gdscs.
Change-Id: If3061a7603035e799e7548f0e2a93b7ded0e3005
Signed-off-by: Anaadi Mishra <quic_anaadim@quicinc.com>