drm/bridge/sii8620: respond to feature requests

MHL3 protocol requires device to respond to feature request from peer.
This minimal answer fulfills the requirement and allows to continue
negotiation.
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1485935272-17337-9-git-send-email-a.hajda@samsung.com

drivers/gpu/drm/bridge/sil-sii8620.c

@@ -1475,6 +1475,10 @@ static void sii8620_msc_mr_set_int(struct sii8620 *ctx)
 			break;
 		}
 	}
+	if (ints[MHL_INT_RCHANGE] & MHL_INT_RC_FEAT_REQ) {
+		sii8620_mt_set_int(ctx, MHL_INT_REG(RCHANGE),
+				   MHL_INT_RC_FEAT_COMPLETE);
+	}
 }
 
 static struct sii8620_mt_msg *sii8620_msc_msg_first(struct sii8620 *ctx)