otautil: Rename dir/sys/thermal utils.

Test: mmma -j bootable/recovery
Change-Id: I32ab98549e91f993364306e4a88dc654221b3869
diff --git a/install.cpp b/install.cpp
index 30fd2c6..a4c6986 100644
--- a/install.cpp
+++ b/install.cpp
@@ -49,10 +49,10 @@
 #include <ziparchive/zip_archive.h>
 
 #include "common.h"
-#include "otautil/SysUtil.h"
-#include "otautil/ThermalUtil.h"
 #include "otautil/error_code.h"
 #include "otautil/paths.h"
+#include "otautil/sysutil.h"
+#include "otautil/thermalutil.h"
 #include "private/install.h"
 #include "roots.h"
 #include "ui.h"