Add av1_ prefix on ###_rd_stats functions

Change-Id: I3bc782d68bcd9b52b38210eec9eecb21146fde75
diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index eab01f6..6f82e83 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -6185,7 +6185,7 @@
     const struct macroblockd_plane *const pd = &xd->plane[plane];
     int coeff_ctx = 1;
     RD_STATS this_rd_stats;
-    init_rd_stats(&this_rd_stats);
+    av1_init_rd_stats(&this_rd_stats);
 
     tx_size = max_txsize_lookup[bsize];
     tx_size =
@@ -6240,7 +6240,7 @@
     mbmi->tx_type = tx_type;
 
 #if CONFIG_VAR_TX
-    init_rd_stats(&this_rd_stats);
+    av1_init_rd_stats(&this_rd_stats);
 
     av1_get_entropy_contexts(bsize, tx_size, pd, ctxa, ctxl);
     coeff_ctx = combine_entropy_contexts(ctxa[0], ctxl[0]);