Add support of "Thermal fast Sampling Period (_TFP)" for passive
cooling.

As per the ACPI specification (ACPI 6.5, Section 11.4.17 "_TFP (Thermal
fast Sampling Period)", _TFP overrides _TSP ("Thermal Sampling Period"
if both are present in a Thermal zone.
Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
Co-developed-by: Sumit Gupta <sumitg@nvidia.com>
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>