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

Test: compile
Bug: 119313545
Change-Id: I664fb32522d01909c603d7b903475c4e9aea9223
diff --git a/tests/component/bootloader_message_test.cpp b/tests/component/bootloader_message_test.cpp
index 6cc59a4..b005d19 100644
--- a/tests/component/bootloader_message_test.cpp
+++ b/tests/component/bootloader_message_test.cpp
@@ -17,8 +17,8 @@
 #include <string>
 #include <vector>
 
+#include <android-base/file.h>
 #include <android-base/strings.h>
-#include <android-base/test_utils.h>
 #include <bootloader_message/bootloader_message.h>
 #include <gtest/gtest.h>