[ST02] Add methods for synthesizing DNS packets

This re-submit aosp/1387135 but define TYPE_CNAME locally to
prevent from using non-finalize API.

Bug: 139774492
Test: atest NetworkStaticLibTests:com.android.net.moduletests.util.DnsPacketUtilsTest

Change-Id: Ib2e98292be994ca09845c6857b8884f9bcdaba80
diff --git a/staticlibs/Android.bp b/staticlibs/Android.bp
index 4dfc752..f4997a1 100644
--- a/staticlibs/Android.bp
+++ b/staticlibs/Android.bp
@@ -96,7 +96,10 @@
     visibility: [
         "//packages/services/Iwlan:__subpackages__",
     ],
-    libs: ["framework-annotations-lib"],
+    libs: [
+        "framework-annotations-lib",
+        "framework-connectivity.stubs.module_lib",
+    ],
 }
 
 filegroup {