Add a netd interface command to disable ND offload.

This will be used to support 464xlat on wifi and IPv6 tethering.

Bug: 12111730
Change-Id: I3b97f4dfb787b2c5d5021811c6da51850bdc70d1
diff --git a/server/InterfaceController.h b/server/InterfaceController.h
index f6e8cbd..71e4344 100644
--- a/server/InterfaceController.h
+++ b/server/InterfaceController.h
@@ -23,6 +23,7 @@
 	virtual ~InterfaceController();
 	int setEnableIPv6(const char *interface, const int on);
 	int setIPv6PrivacyExtensions(const char *interface, const int on);
+	int setIPv6NdOffload(char* interface, const int on);
 	int setMtu(const char *interface, const char *mtu);
 
  private: