Use Truth in PackageWatchdogTest.java

Bug: 140700197
Test: PackageWatchdogTest
Change-Id: I6ffae52a2f31a56ad4577368e204edf3f62adfd1
diff --git a/tests/PackageWatchdog/Android.bp b/tests/PackageWatchdog/Android.bp
index 88d92c4..0b75039 100644
--- a/tests/PackageWatchdog/Android.bp
+++ b/tests/PackageWatchdog/Android.bp
@@ -23,6 +23,7 @@
         "androidx.test.rules",
         "services.core",
         "services.net",
+        "truth-prebuilt",
     ],
     libs: ["android.test.runner"],
     jni_libs: [