Offset probabilities of compound types for cb4x4

BUG=aomedia:313

Change-Id: Ic1a9e20e5fd3f645d3be851d7be759cf4caf7c02
diff --git a/av1/common/entropymode.c b/av1/common/entropymode.c
index 688fc72..4db2ba9 100644
--- a/av1/common/entropymode.c
+++ b/av1/common/entropymode.c
@@ -511,6 +511,9 @@
 #if CONFIG_COMPOUND_SEGMENT
 static const aom_prob
     default_compound_type_probs[BLOCK_SIZES][COMPOUND_TYPES - 1] = {
+#if CONFIG_CB4X4
+      { 255, 255 }, { 255, 255 }, { 255, 255 },
+#endif
       { 208, 200 }, { 208, 200 }, { 208, 200 }, { 208, 200 }, { 208, 200 },
       { 208, 200 }, { 216, 200 }, { 216, 200 }, { 216, 200 }, { 224, 200 },
       { 224, 200 }, { 240, 200 }, { 240, 200 },