drm/nouveau/dp: enable down-spread if vbios and sink support it

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_encoder.h b/drivers/gpu/drm/nouveau/nouveau_encoder.h
index deafe7b..e5d6e3f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_encoder.h
+++ b/drivers/gpu/drm/nouveau/nouveau_encoder.h
@@ -49,10 +49,9 @@
 
 	union {
 		struct {
-			int dpcd_version;
+			u8  dpcd[8];
 			int link_nr;
 			int link_bw;
-			bool enhanced_frame;
 			u32 datarate;
 		} dp;
 	};