arm64: dts: qcom: sm8250: Add thermal zones and throttling support

sm8250 has 24 thermal sensors split across two tsens controllers. Add
the thermal zones to expose them and wireup the cpus to throttle on
crossing passive temperature thresholds.

Update the comment in the drivers to list the SoCs it supports.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>