arm64: dts: qcom: Add device tree for SDM636

This SoC is almost identical to its older brother,
SDM660, with a few minor exceptions like the
different GPU.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210728222542.54269-26-konrad.dybcio@somainline.org


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