ARM: dts: qcom: pm8841: Add thermal zone config

Add thermal zone for the PMIC thermal sensor. Temperatures are based on
downstream values, except for critical trip point where 140°C is used
instead of 145°C due to limitations without a configured ADC.

Signed-off-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230529221501.43455-3-matti.lehtimaki@gmail.com