drm/nouveau/nvif: split out display interface definitions

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 8d00d00..40612e7 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -42,6 +42,7 @@
 #include "nouveau_encoder.h"
 #include "nouveau_crtc.h"
 
+#include <nvif/cl0046.h>
 #include <nvif/event.h>
 
 MODULE_PARM_DESC(tv_disable, "Disable TV-out detection");