Move error_code.h into otautil.

This way it stops requiring relative path ".." in LOCAL_C_INCLUDES
(uncrypt and edify). Soong doesn't accept non-local ".." in
"local_include_dirs".

Test: mmma bootable/recovery
Change-Id: Ia4649789cef2aaeb2785483660e9ea5a8b389c62
diff --git a/updater/blockimg.cpp b/updater/blockimg.cpp
index 696cddf..0f83644 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"
diff --git a/updater/install.cpp b/updater/install.cpp
index fc085d5..01210f5 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -57,10 +57,10 @@
 #include <ziparchive/zip_archive.h>
 
 #include "edify/expr.h"
-#include "error_code.h"
 #include "mounts.h"
 #include "otafault/ota_io.h"
 #include "otautil/DirUtil.h"
+#include "otautil/error_code.h"
 #include "print_sha1.h"
 #include "tune2fs.h"
 #include "updater/updater.h"