Cleanup: Remove const for params passed by value

BUG=aomedia:448

Change-Id: Ieff977fca8a5033ddef2871a194870f59301ad8f

aom_dsp/bitreader.h

diff --git a/aom_dsp/bitreader.h b/aom_dsp/bitreader.h
index bd0a173..9cd34dd 100644
--- a/aom_dsp/bitreader.h
+++ b/aom_dsp/bitreader.h
@@ -143,8 +143,7 @@
   }
 }
 
-static INLINE void aom_update_symb_counts(const aom_reader *r,
-                                          const int is_binary) {
+static INLINE void aom_update_symb_counts(const aom_reader *r, int is_binary) {
   if (r->accounting != NULL) {
     r->accounting->syms.num_multi_syms += !is_binary;
     r->accounting->syms.num_binary_syms += !!is_binary;