arm64: dts: qcom: sm8250: Add USB and PHY device nodes

Add device nodes for the USB3 controller, QMP SS PHY and
SNPS HS PHY.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Link: https://lore.kernel.org/r/20200609194030.17756-7-jonathan@marek.ca


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>