[MS67.2] Modify tests for registerUsageCallback

Test: atest FrameworksNetTests
Bug: 204830222
Change-Id: Ia4ff535cd703807516d65b582727684cbb670360
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index 48751f4..2927e43 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -89,6 +89,7 @@
         "java/com/android/server/connectivity/VpnTest.java",
         "java/com/android/server/net/ipmemorystore/*.java",
         "java/com/android/server/net/NetworkStats*.java",
+        "java/com/android/server/net/TestableUsageCallback.kt",
     ]
 }