qxl: use drm helper hotplug support

This uses the helper to deal with hotplug so fbdev gets included.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 2c6f921..9e8da9e 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -26,6 +26,7 @@
 #include "qxl_drv.h"
 #include "qxl_object.h"
 
+#include <drm/drm_crtc_helper.h>
 #include <linux/io-mapping.h>
 
 int qxl_log_level;
@@ -307,6 +308,8 @@
 		goto out;
 	}
 
+	drm_kms_helper_poll_init(qdev->ddev);
+
 	return 0;
 out:
 	kfree(qdev);