Define VcnUnderlyingNetworkPolicy.

Bug: 175729529
Test: atest FrameworksVcnTests
Change-Id: I57c732640d6d21db1f4d68c69ff320918e7891c3
diff --git a/tests/vcn/Android.bp b/tests/vcn/Android.bp
index 3c08d34..c04ddd7 100644
--- a/tests/vcn/Android.bp
+++ b/tests/vcn/Android.bp
@@ -16,6 +16,7 @@
         "frameworks-base-testutils",
         "framework-protos",
         "mockito-target-minus-junit4",
+        "net-tests-utils",
         "platform-test-annotations",
         "services.core",
     ],