Add CTS tests for registerDefaultNetworkCallbackAsUid.

Bug: 165835257
Test: test-only change
Change-Id: Ib3266665735ee587f3f8ae82dadd1e4ca7ce4353
diff --git a/tests/cts/hostside/app/Android.bp b/tests/cts/hostside/app/Android.bp
index f351b47..112b9eb 100644
--- a/tests/cts/hostside/app/Android.bp
+++ b/tests/cts/hostside/app/Android.bp
@@ -27,6 +27,7 @@
         "androidx.test.rules",
         "androidx.test.ext.junit",
         "compatibility-device-util-axt",
+        "cts-net-utils",
         "ctstestrunner-axt",
         "ub-uiautomator",
         "CtsHostsideNetworkTestsAidl",