arm64: dts: qcom: sm8350: Add CPU topology and idle-states

Add CPU topology and define the idle states for the silver and gold
cores as well as the cluster.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Link: https://lore.kernel.org/r/20210825221600.1498939-1-bjorn.andersson@linaro.org