ACPI spec says (11.5 Thermal Zone Interface Requirements):
   A thermal zone must contain at least one trip point
   (critical, near critical, active, or passive)

Check this once at init time.
Signed-off-by: NThomas Renninger <trenn@suse.de>
Tested-by: clarkt@cnsp.com
Signed-off-by: NLen Brown <len.brown@intel.com>