net/neighbor: Simplify the neighbor table aging process

net/devif/devif_poll.c

@@ -50,7 +50,6 @@
 
 #include "devif/devif.h"
 #include "arp/arp.h"
-#include "neighbor/neighbor.h"
 #include "tcp/tcp.h"
 #include "udp/udp.h"
 #include "pkt/pkt.h"
@@ -787,12 +786,6 @@ int devif_timer(FAR struct net_driver_s *dev, devif_poll_callback_t callback)
         }
 #endif
 
-#ifdef CONFIG_NET_IPv6
-      /* Perform aging on the entries in the Neighbor Table */
-
-       neighbor_periodic(hsec);
-#endif
-
 #ifdef NET_TCP_HAVE_STACK
       /* Traverse all of the active TCP connections and perform the
        * timer action.