otautil: Rename dir/sys/thermal utils.

Test: mmma -j bootable/recovery
Change-Id: I32ab98549e91f993364306e4a88dc654221b3869
diff --git a/updater/install.cpp b/updater/install.cpp
index 5623c33..b41d48c 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -58,7 +58,7 @@
 
 #include "edify/expr.h"
 #include "otafault/ota_io.h"
-#include "otautil/DirUtil.h"
+#include "otautil/dirutil.h"
 #include "otautil/error_code.h"
 #include "otautil/mounts.h"
 #include "otautil/print_sha1.h"