thermal: Make thermal_zone_device_is_enabled() available to core only

This function is not needed by drivers.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200703104354.19657-4-andrzej.p@collabora.com

drivers/thermal/thermal_core.c

@@ -519,7 +519,6 @@ int thermal_zone_device_is_enabled(struct thermal_zone_device *tz)
 
 	return mode == THERMAL_DEVICE_ENABLED;
 }
-EXPORT_SYMBOL_GPL(thermal_zone_device_is_enabled);
 
 void thermal_zone_device_update(struct thermal_zone_device *tz,
 				enum thermal_notify_event event)

drivers/thermal/thermal_core.h

@@ -166,4 +166,6 @@ of_thermal_get_trip_points(struct thermal_zone_device *tz)
 }
 #endif
 
+int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
+
 #endif /* __THERMAL_CORE_H__ */

include/linux/thermal.h

@@ -418,7 +418,6 @@ void thermal_cdev_update(struct thermal_cooling_device *);
 void thermal_notify_framework(struct thermal_zone_device *, int);
 int thermal_zone_device_enable(struct thermal_zone_device *tz);
 int thermal_zone_device_disable(struct thermal_zone_device *tz);
-int thermal_zone_device_is_enabled(struct thermal_zone_device *tz);
 #else
 static inline struct thermal_zone_device *thermal_zone_device_register(
 	const char *type, int trips, int mask, void *devdata,
@@ -472,10 +471,6 @@ static inline int thermal_zone_device_enable(struct thermal_zone_device *tz)
 
 static inline int thermal_zone_device_disable(struct thermal_zone_device *tz)
 { return -ENODEV; }
-
-static inline int
-thermal_zone_device_is_enabled(struct thermal_zone_device *tz)
-{ return -ENODEV; }
 #endif /* CONFIG_THERMAL */
 
 #endif /* __THERMAL_H__ */