* xlat/rtnl_ifla_brport_attrs.in: Add IFLA_BRPORT_GROUP_FWD_MASK
constant introduced by Linux kernel commit v4.15-rc1~84^2~607.
Add IFLA_BRPORT_NEIGH_SUPPRESS constant introduced by Linux kernel
commit v4.15-rc1~84^2~523^2~2.
Add IFLA_BRPORT_ISOLATED constant introduced by Linux kernel commit
v4.18-rc1~114^2~142.
IFLA_BRPORT_MCAST_TO_UCAST 28
IFLA_BRPORT_VLAN_TUNNEL 29
IFLA_BRPORT_BCAST_FLOOD 30
+IFLA_BRPORT_GROUP_FWD_MASK 31
+IFLA_BRPORT_NEIGH_SUPPRESS 32
+IFLA_BRPORT_ISOLATED 33