Revert "Move error_code.h into otautil."

This reverts commit 623fe7e701d5d0fb17082d1ced14498af1b44e5b.

Reason for revert: Need to address device-specific modules.

Change-Id: Ib7a4191e7f193dfff49b02d3de76dda856800251
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 0f83644..696cddf 100644
--- a/updater/blockimg.cpp
+++ b/updater/blockimg.cpp
@@ -50,8 +50,8 @@
 #include <ziparchive/zip_archive.h>
 
 #include "edify/expr.h"
+#include "error_code.h"
 #include "otafault/ota_io.h"
-#include "otautil/error_code.h"
 #include "print_sha1.h"
 #include "rangeset.h"
 #include "updater/install.h"