Use canonical UniquePtr.h header

Change-Id: I0487bd53fc946e1a488d7109eebd402d1ecc5a0a
diff --git a/tests/keymaster/keymaster_test.cpp b/tests/keymaster/keymaster_test.cpp
index ad89012..6b76ccb 100644
--- a/tests/keymaster/keymaster_test.cpp
+++ b/tests/keymaster/keymaster_test.cpp
@@ -32,7 +32,8 @@
 
 #define LOG_TAG "keymaster_test"
 #include <utils/Log.h>
-#include <utils/UniquePtr.h>
+
+#include <UniquePtr.h>
 
 #include <hardware/keymaster.h>