arm64: dts: qcom: sm8250: add I2C and SPI nodes

Much like SDM845 each serial engine has 4 pins attached. Add all
possible I2C and SPI nodes for all 20 serial engines.
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20200606131300.3874987-1-dmitry.baryshkov@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>