drm/i915: Use drm_modeset_lock_all() in debugfs display info

	wakeref = intel_runtime_pm_get(&dev_priv->runtime_pm);

	drm_modeset_lock_all(dev);

	seq_printf(m, "CRTC info\n");

	seq_printf(m, "---------\n");

	for_each_intel_crtc(dev, crtc) {

		drm_modeset_lock(&crtc->base.mutex, NULL);

	for_each_intel_crtc(dev, crtc)

		intel_crtc_info(m, crtc);

		drm_modeset_unlock(&crtc->base.mutex);

	}

	seq_printf(m, "\n");

	seq_printf(m, "Connector info\n");

	seq_printf(m, "--------------\n");

	mutex_lock(&dev->mode_config.mutex);

	drm_connector_list_iter_begin(dev, &conn_iter);

	drm_for_each_connector_iter(connector, &conn_iter)

		intel_connector_info(m, connector);

	drm_connector_list_iter_end(&conn_iter);

	mutex_unlock(&dev->mode_config.mutex);

	drm_modeset_unlock_all(dev);

	intel_runtime_pm_put(&dev_priv->runtime_pm, wakeref);