Chroma Fix for Superblock CDF update

UV_INTRA_MODES must be used for chroma modes

Change-Id: I3e72d16204d11062a850fd00fb6272358dd61aac
diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index dc0a32d..0aa384a 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -5898,7 +5898,8 @@
 #if CONFIG_ENTROPY_STATS
   ++counts->uv_mode[y_mode][uv_mode];
 #endif  // CONFIG_ENTROPY_STATS
-  update_cdf(fc->uv_mode_cdf[y_mode], av1_intra_mode_ind[uv_mode], INTRA_MODES);
+  update_cdf(fc->uv_mode_cdf[y_mode], av1_intra_mode_ind[uv_mode],
+             UV_INTRA_MODES);
 }
 
 #if CONFIG_VAR_TX