Support registering cooling devices with dynamic power coefficient
where provided by the device tree. This allows OF registered cooling
devices driver to be used with the power_allocator thermal governor.
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>