dt-bindings: display: msm: sm6150-mdss: Fix example indentation and OPP values

dt-bindings: display: msm: sm6150-mdss: Fix example indentation and OPP values

Improve the binding example by fixing indentation and adding missing
blank lines for better readability. Also correct the OPP clock values
to match the actual SM6150 DTS configuration.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Xiangxu Yin <xiangxu.yin@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/685342/
Link: https://lore.kernel.org/r/20251104-add-displayport-support-to-qcs615-devicetree-v7-2-e51669170a6f@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>