dpaa2-switch: add support for configuring per port broadcast flooding

The BR_BCAST_FLOOD bridge port flag is now accepted by the driver and a
change in its state will determine a reconfiguration of the broadcast
egress flooding list on the FDB associated with the port.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>