Implement permissions set/clear for both networks and users.

(cherry picked from commit 47a0fa0ad402704b639fbc2868c55adc432bb6ea)

Change-Id: Ibb71025e1e2c72bd300fb7379d5ab54da4a6982e
diff --git a/RouteController.h b/RouteController.h
index 2c80954..65f8f84 100644
--- a/RouteController.h
+++ b/RouteController.h
@@ -25,6 +25,8 @@
 
     static bool createNetwork(unsigned netId, const char* interface, Permission permission);
     static bool destroyNetwork(unsigned netId, const char* interface, Permission permission);
+    static bool modifyNetworkPermission(unsigned netId, const char* interface,
+                                        Permission oldPermission, Permission newPermission);
 };
 
 #endif  // SYSTEM_NETD_ROUTE_CONTROLLER_H