Rename daala_read_tree_cdf() to daala_read_symbol().

Change-Id: I35f85bad88c637cea62577c546cdd5ced0e21bd6

aom_dsp/bitreader.h

@@ -140,7 +140,7 @@ static INLINE int aom_read_symbol(aom_reader *r, const aom_cdf_prob *cdf,
 static INLINE int aom_read_tree_cdf(aom_reader *r, const uint16_t *cdf,
                                     int nsymbs) {
 #if CONFIG_DAALA_EC
-  return daala_read_tree_cdf(r, cdf, nsymbs);
+  return daala_read_symbol(r, cdf, nsymbs);
 #else
   (void)r;
   (void)cdf;

aom_dsp/daalaboolreader.h

@@ -66,7 +66,7 @@ static INLINE int daala_read_tree_bits(daala_reader *r,
   return -i;
 }
 
-static INLINE int daala_read_tree_cdf(daala_reader *r, const uint16_t *cdf,
+static INLINE int daala_read_symbol(daala_reader *r, const uint16_t *cdf,
                                     int nsymbs) {
   return od_ec_decode_cdf_q15(&r->ec, cdf, nsymbs, "aom");
 }