arm64: dts: qcom: sm8550: add ports subnodes in usb/dp qmpphy node

Add the USB3+DP Combo QMP PHY port subnodes in the SM8550 SoC DTSI
to avoid duplication in the devices DTs.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230601-topic-sm8550-upstream-type-c-v5-4-9221cd300903@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>