arch64: dts: qcom: sm8250: add uart nodes

Currently sm8250.dtsi only defines default debug uart. Port rest uart
nodes from the downstream dtsi file.

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20200909103238.149761-1-dmitry.baryshkov@linaro.org


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