drm/rockchip: cdn-dp: Move mutex_init to probe

We're trying to lock mutex when cdn-dp shutdown, so we need to make
sure the mutex is inited in cdn-dp's probe.
Signed-off-by: NJeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: NGuenter Roeck <groeck@chromium.org>
Reviewed-by: NChris Zhong <zyw@rock-chips.com>
Signed-off-by: NChris Zhong <zyw@rock-chips.com>

drivers/gpu/drm/rockchip/cdn-dp-core.c

@@ -1041,7 +1041,6 @@ static int cdn_dp_bind(struct device *dev, struct device *master, void *data)
 	dp->connected = false;
 	dp->active = false;
 
-	mutex_init(&dp->lock);
 	INIT_WORK(&dp->event_work, cdn_dp_pd_event_work);
 
 	encoder = &dp->encoder;
@@ -1204,6 +1203,7 @@ static int cdn_dp_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	mutex_init(&dp->lock);
 	dev_set_drvdata(dev, dp);
 
 	return component_add(dev, &cdn_dp_component_ops);