thermal: convert rcar_thermal to use devm_thermal_zone_of_sensor_register

This changes the driver to use the devm_ version
of thermal_zone_of_sensor_register and cleans
up the  local points and unregister calls.

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>

drivers/thermal/rcar_thermal.c

@@ -492,7 +492,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
 			goto error_unregister;
 
 		if (of_data == USE_OF_THERMAL)
-			priv->zone = thermal_zone_of_sensor_register(
+			priv->zone = devm_thermal_zone_of_sensor_register(
 						dev, i, priv,
 						&rcar_thermal_zone_of_ops);
 		else