arm64: dts: qcom: sm6115: Add USB SS qmp phy node

Add USB superspeed qmp phy node to dtsi.

Make sure that the various board dts files (which include sm4250.dtsi file)
continue to work as intended.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230516150511.2346357-4-bhupesh.sharma@linaro.org