drm/nouveau: reorganise bios header, add dcb connector type enums

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index ea71ce4..ca65a5b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -5388,6 +5388,8 @@
 		/* weird g80 mobile type that "nv" treats as a terminator */
 		dcb->entries--;
 		return false;
+	default:
+		break;
 	}
 
 	/* unsure what DCB version introduces this, 3.0? */