dt-bindings: phy: qcom,qmp-usb3-dp: document sm8350 & sm8450 compatible

Document the USB3/DP Combo PHY compatible found on the SM8350 & SM8450 SoCs.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230206-topic-sm8350-upstream-usb-dp-combo-phy-v1-1-ed849ae6b849@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>