Add additional SystemApi for NetworkStack

Members in this CL were missed in earlier changes.

Test: m
Bug: 112869080
Merged-In: I8b5b80ea7b267357eb0387d504a2f78358d6d502
Change-Id: I8b9b15f8b91962f3ef554fd222a825e471806c9e

core/java/android/net/LinkAddress.java

@@ -162,6 +162,8 @@ public class LinkAddress implements Parcelable {
      *              {@link OsConstants#RT_SCOPE_LINK} or {@link OsConstants#RT_SCOPE_SITE}).
      * @hide
      */
+    @SystemApi
+    @TestApi
     public LinkAddress(InetAddress address, int prefixLength, int flags, int scope) {
         init(address, prefixLength, flags, scope);
     }