net/mlx4_en: Re-arrange ndo_set_rx_mode related code

Currently, mlx4_en_do_set_multicast serves as the ndo_set_rx_mode entry for mlx4_en,
doing all related work. Split it to few calls, one per required functionality
(e.g multicast, promiscuous, etc) and rename some structures and calls
to use rx_mode notation instead of multicast.
Signed-off-by: Yan Burman <yanb@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

@@ -504,7 +504,7 @@ struct mlx4_en_priv {
 	struct mlx4_en_cq *tx_cq;
 	struct mlx4_en_cq rx_cq[MAX_RX_RINGS];
 	struct mlx4_qp drop_qp;
-	struct work_struct mcast_task;
+	struct work_struct rx_mode_task;
 	struct work_struct mac_task;
 	struct work_struct watchdog_task;
 	struct work_struct linkstate_task;