net/arp: clean the arp table when netdev carrier off

Fix the arp address changed if netdev renew, since the
arp table should be cleared when the netdev carrier off

Signed-off-by: songlinzhang <songlinzhang@xiaomi.com>

net/netdev/netdev_carrier.c

@@ -37,6 +37,7 @@
 
 #include "netdev/netdev.h"
 #include "netlink/netlink.h"
+#include "arp/arp.h"
 
 /****************************************************************************
  * Public Functions
@@ -94,6 +95,7 @@ int netdev_carrier_off(FAR struct net_driver_s *dev)
       /* Notify clients that the network has been taken down */
 
       devif_dev_event(dev, NULL, NETDEV_DOWN);
+      arp_cleanup(dev);
 
       return OK;
     }