dt-bindings: thermal: qcom-spmi-temp-alarm: Improve thermal zone in example

The current example for a thermal zone isn't very useful as reference
since it would result in a hardware shutdown at 145°C, instead of
allowing the system to try to shutdown gracefully. Without an ADC
channel a maximum of two trip points is useful in practice for this
sensor, with temperatures corresponding to the stage 1 and stage 2
'hardware trip points'. A critical trip point at stage 2 may allow the
system to shutdown before a hardware shutdown at stage 3 kicks in. It
should be noted though that by default the chip performs a 'partial
shutdown' when the temperature reaches stage 2, which may prevent an
orderly shutdown. The 'partial shutdown' can be disabled by software.

Signed-off-by: Matthias Kaehlcke <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Eduardo Valentin <[email protected]>

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