disp: msm: sde: reduce log level of thermal backlight device

The change reduces the log level if the thermal backlight device
registration fails. This is not a fatal use case and hence shouldn't
be an error log.

Change-Id: I08d4014a2629c5181bd7219c4836affb81da96ae
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>

msm/sde/sde_connector.c

@@ -240,7 +240,7 @@ static int sde_backlight_setup(struct sde_connector *c_conn,
 	c_conn->cdev = backlight_cdev_register(dev->dev, c_conn->bl_device,
 							&c_conn->n);
 	if (IS_ERR_OR_NULL(c_conn->cdev)) {
-		SDE_ERROR("Failed to register backlight cdev: %ld\n",
+		SDE_INFO("Failed to register backlight cdev: %ld\n",
 				    PTR_ERR(c_conn->cdev));
 		c_conn->cdev = NULL;
 	}