Do DNS64 prefix discovery in netd

Test: as follows
    - built, flashed, booted
    - system/netd/tests/runtests.sh passes
    - dumpsys netd observes DNS64 discovery output
Bug: 78545619
Change-Id: I447c35229b07e8077546a03489d36e7be9d969a3
diff --git a/server/Controllers.cpp b/server/Controllers.cpp
index 23f3e9c..f590307 100644
--- a/server/Controllers.cpp
+++ b/server/Controllers.cpp
@@ -189,7 +189,8 @@
 }
 
 Controllers::Controllers()
-    : clatdCtrl(&netCtrl),
+    : resolverCtrl(netCtrl),
+      clatdCtrl(&netCtrl),
       wakeupCtrl(
               [this](const WakeupController::ReportArgs& args) {
                   const auto listener = eventReporter.getNetdEventListener();