Thermal: Rename thermal_zone_device.cooling_devices

Rename thermal_zone_device.cooling_devices
to thermal_zone_device.thermal_instances

thermal_zone_device.cooling_devices is not accurate
as this is a list for thermal instances, rather than cooling devices.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Eduardo Valentin <eduardo.valentin@ti.com>
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 38267a5..cb0b0e3 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -122,9 +122,9 @@
 	bool passive;
 	unsigned int forced_passive;
 	const struct thermal_zone_device_ops *ops;
-	struct list_head cooling_devices;
+	struct list_head thermal_instances;
 	struct idr idr;
-	struct mutex lock;	/* protect cooling devices list */
+	struct mutex lock; /* protect thermal_instances list */
 	struct list_head node;
 	struct delayed_work poll_queue;
 };