drm/sun4i: sun4i: Register quirks with the backend structure

In prevision for introducing a new quirk that will be used at atomic
plane check time, register the quirks structure with the backend
structure. This way, it can easily be grabbed where needed.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180719080838.31598-1-paul.kocialkowski@bootlin.com
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h
index 4caee03..ad66093 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
@@ -187,6 +187,8 @@ struct sun4i_backend {
 	/* Protects against races in the frontend teardown */
 	spinlock_t		frontend_lock;
 	bool			frontend_teardown;
+
+	const struct sun4i_backend_quirks	*quirks;
 };
 
 static inline struct sun4i_backend *