arm64: dts: qcom: sm8450: add ports subnodes in usb1 qmpphy node

Add the USB3+DP Combo QMP PHY port subnodes in the SM8450 SoC DTSI
to avoid duplication in the devices DTs.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230503-topic-sm8450-graphics-dp-next-v3-2-6c43d293995f@linaro.org