This patch adds an ndm_state member to the switchdev_obj_fdb structure,
in order to support static FDB addresses.

Set Rocker ndm_state to NUD_REACHABLE.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: NScott Feldman <sfeldma@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>