thermal: gov_power_allocator: Check the cooling devices only for trip_max

The throttling logic only cares about the last passive trip point and
the cooling devices attached to it.

Therefore, there is no need to bail out if other trip points have
cooling devices which are not a supported by the IPA.

Check the cooling devices only for 'trip_max' during the binding.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>