arm64: dts: qcom: sm8250: Add DisplayPort device node

Declare the displayport controller present on the Qualcomm SM8250 SoC.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230817145940.9887-2-dmitry.baryshkov@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>