thermal: gov_step_wise: Fold update_passive_instance() into its caller

Fold update_passive_instance() into thermal_zone_trip_update() that is
its only caller so as to make the code in question easier to follow.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>