thermal: core: move to_thermal_zone() macro to header file

Simply making this macro available to other thermal core
files.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/thermal_core.c

@@ -800,9 +800,6 @@ int thermal_build_list_of_policies(char *buf)
 
 /* sys I/F for thermal zone */
 
-#define to_thermal_zone(_dev) \
-	container_of(_dev, struct thermal_zone_device, device)
-
 static ssize_t
 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 {

drivers/thermal/thermal_core.h

@@ -54,6 +54,9 @@ struct thermal_instance {
 	unsigned int weight; /* The weight of the cooling device */
 };
 
+#define to_thermal_zone(_dev) \
+	container_of(_dev, struct thermal_zone_device, device)
+
 int thermal_register_governor(struct thermal_governor *);
 void thermal_unregister_governor(struct thermal_governor *);
 void thermal_zone_device_rebind_exception(struct thermal_zone_device *,