LAG FDB entries pointing to VLAN devices should be reported to the
bridge with the matching VLAN device and not the underlying LAG device.

Fixes: aac78a44 ("mlxsw: spectrum: Adjust FDB notifications for VLAN devices")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>