[Code Cleanup] Move accounting.[ch] to decoder

Bit accounting is really a decoder thing

BUG=aomedia:450

Change-Id: Ib0229064caa98f742e2df08fd79c0451b0d8c09e
diff --git a/aom_dsp/bitreader.h b/aom_dsp/bitreader.h
index fec5afb..bd0a173 100644
--- a/aom_dsp/bitreader.h
+++ b/aom_dsp/bitreader.h
@@ -33,7 +33,7 @@
 #include "av1/common/odintrin.h"
 
 #if CONFIG_ACCOUNTING
-#include "av1/common/accounting.h"
+#include "av1/decoder/accounting.h"
 #define ACCT_STR_NAME acct_str
 #define ACCT_STR_PARAM , const char *ACCT_STR_NAME
 #define ACCT_STR_ARG(s) , s