ACPI: thermal: Create and populate trip points table earlier

Create and populate the driver's trip points table in acpi_thermal_add()
so as to allow the its data structures to be simplified going forward.

No intentional functional impact.

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