arm64: dts: qcom: sm8550: Separate out X3 idle state

The X3 core has different entry/exit/residency time requirements than
the big cluster. Denote them to stop confusing the scheduler.

Fixes: ffc50b2d

 ("arm64: dts: qcom: Add base SM8550 dtsi")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231218-topic-8550_fixes-v1-11-ce1272d77540@linaro.org


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