thermal/core: Avoid calling ->get_trip_temp() unnecessarily

As the trip temperature is already available when calling the function
handle_critical_trips(), pass it as a parameter instead of having this
function calling the ops again to retrieve the same data.

Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20220718145038.1114379-2-daniel.lezcano@linaro.org