drm/msm/dpu: move setup_force_clk_ctrl handling into plane and wb

Now SSPP and WB can have setup_force_clk_ctrl() ops, it's simpler to call
them from the plane and wb code and call into the mdp ops if not present.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/562325/


Signed-off-by: Rob Clark <robdclark@chromium.org>