Mark videocc clock node as GenPD provider and disable the
video GDSC regulator nodes for tuna platform.
While at it, keep the gdsc regulator nodes as it is on rumi platform.
Change-Id: I8e8fc066ea54f16ccbc73b9b8705881b27d4d112
Signed-off-by: Anaadi Mishra <quic_anaadim@quicinc.com>