clk: qcom: dispcc-sm6115: use parent_hws for disp_cc_mdss_rot_clk

Rework disp_cc_mdss_rot_clk to use parent_hws instead of parent_names.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221210190712.451247-1-dmitry.baryshkov@linaro.org