switch to using android-base/file.h instead of android-base/test_utils.h

Test: compile
Bug: 119313545
Change-Id: I4f7ad84743e974b4b4d1d7256088f6c8b749a237
diff --git a/init/devices_test.cpp b/init/devices_test.cpp
index d658f4d..3e7c1a8 100644
--- a/init/devices_test.cpp
+++ b/init/devices_test.cpp
@@ -16,8 +16,8 @@
 
 #include "devices.h"
 
+#include <android-base/file.h>
 #include <android-base/scopeguard.h>
-#include <android-base/test_utils.h>
 #include <gtest/gtest.h>
 
 #include "util.h"