libconnectivity_native_test_utils: limit visibility

Bug: 324338494
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ied391f3366c87ffb1010ec6e5ece6604a72a7c9b

tests/native/utilities/Android.bp

@@ -18,8 +18,10 @@ package {
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
+// TODO: delete this as it is a cross-module api boundary violation
 cc_test_library {
     name: "libconnectivity_native_test_utils",
+    visibility: ["//packages/modules/DnsResolver/tests:__subpackages__"],
     defaults: [
         "netd_defaults",
         "resolv_test_defaults",