arm64: dts: qcom: sc8280xp-lenovo-thinkpad-x13: Set up 4-lane DP

arm64: dts: qcom: sc8280xp-lenovo-thinkpad-x13: Set up 4-lane DP

Allow up to 4 lanes for the DisplayPort link from the PHYs to the
controllers and allow mode-switch events to reach the QMP Combo PHYs.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
[konrad: reword]
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Lenovo Thinkpad T14S
Link: https://lore.kernel.org/r/20250807-topic-4ln_dp_respin-v4-6-43272d6eca92@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>