Trigger enabling of NDO when startProvisioning() is called.

Bug: 26238390
Bug: 27598285
Change-Id: I1f63bdd27defd43f994d259d07a943872df4f47c

services/net/java/android/net/ip/IpManager.java

@@ -355,6 +355,8 @@ public class IpManager extends StateMachine {
 
     public void startProvisioning(ProvisioningConfiguration req) {
         getNetworkInterface();
+
+        mCallback.setNeighborDiscoveryOffload(true);
         sendMessage(CMD_START, new ProvisioningConfiguration(req));
     }