drm/nv50: add dcb type 14 to enum to prevent compiler complaint

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.h b/drivers/gpu/drm/nouveau/nouveau_bios.h
index fd14dfd..c1de2f3 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.h
@@ -95,6 +95,7 @@
 	OUTPUT_TMDS = 2,
 	OUTPUT_LVDS = 3,
 	OUTPUT_DP = 6,
+	OUTPUT_EOL = 14, /* DCB 4.0+, appears to be end-of-list */
 	OUTPUT_ANY = -1
 };