dt-bindings: phy: qcom,qmp-usb3-dp: Add support for sc8180x

The SC8180x has two instances of the QMP USB/DP combo PHYs, add a
compatible for these.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210721225630.3035861-1-bjorn.andersson@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>