drm/msm/dpu: sm8550: remove unused VIG and DMA clock controls entries

The SM8550 has the SSPP clk_ctrl in the SSPP registers, remove the
duplicate clock controls from the MDP top.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/562330/


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