otafault: Move headers under otafault/.

Test: mmma bootable/recovery
Change-Id: I3ceb72f703c7c2857d656c137d71baa1fccd8238
diff --git a/updater/install.cpp b/updater/install.cpp
index 8e54c2e..fc085d5 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -59,7 +59,7 @@
 #include "edify/expr.h"
 #include "error_code.h"
 #include "mounts.h"
-#include "ota_io.h"
+#include "otafault/ota_io.h"
 #include "otautil/DirUtil.h"
 #include "print_sha1.h"
 #include "tune2fs.h"