clk: qcom: videocc-sc7180: use parent_hws instead of parent_data

If all parents are specified as clk_hw, we can use parent_hws instead of
parent_data.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211228045415.20543-12-dmitry.baryshkov@linaro.org