arm64: dts: qcom: sm8350: Add missing cluster sleep state

SM8350's cores can be shut off, without engaging full-on SoC-wide power
collapse. Add the missing idle state to allow for that.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230705-topic-sm8350_fixes-v1-1-0f69f70ccb6a@linaro.org


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