arm64: dts: qcom: Add support for SM6125

This commits adds the Device tree file for SM6125 SoC.
Signed-off-by: Martin Botka <martin.botka@somainline.org>
Link: https://lore.kernel.org/r/20210621195308.654587-1-martin.botka@somainline.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>