mlx5: use alternate method to configure promisc and allmulti modes

mlx5: use alternate method to configure promisc and allmulti modes

Promiscuous and allmulticast modes were historically enabled by adding
specific flows with types IBV_FLOW_ATTR_ALL_DEFAULT or
IBV_EXP_FLOW_ATTR_MC_DEFAULT to each hash RX queue, but this method is
deprecated.

- Promiscuous mode is now enabled by omitting destination MAC addresses from
  basic flow specifications.
- Allmulticast mode is now enabled by using flow specifications that match
  the broadcast bit in destination MAC addresses.

Signed-off-by: Olga Shern <olgas@mellanox.com>
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Signed-off-by: Yaacov Hazan <yaacovh@mellanox.com>