bridge: vlan: Add support for neigh_suppress option

bridge: vlan: Add support for neigh_suppress option

Add support for the per-VLAN neigh_suppress option. Example:

 # bridge vlan set vid 10 dev swp1 neigh_suppress on
 # bridge -d -j -p vlan show dev swp1 vid 10
 [ {
         "ifname": "swp1",
         "vlans": [ {
                 "vlan": 10,
                 "state": "forwarding",
                 "mcast_router": 1,
                 "neigh_suppress": true
             } ]
     } ]
 # bridge -d vlan show dev swp1 vid 10
 port              vlan-id
 swp1              10
                     state forwarding mcast_router 1 neigh_suppress on

 # bridge vlan set vid 10 dev swp1 neigh_suppress off
 # bridge -d -j -p vlan show dev swp1 vid 10
 [ {
         "ifname": "swp1",
         "vlans": [ {
                 "vlan": 10,
                 "state": "forwarding",
                 "mcast_router": 1,
                 "neigh_suppress": false
             } ]
     } ]
 # bridge -d vlan show dev swp1 vid 10
 port              vlan-id
 swp1              10
                     state forwarding mcast_router 1 neigh_suppress off

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David Ahern <dsahern@kernel.org>