net/mlx5: Add HW capabilities and structs for SR-IOV E-Switch

Update HCA capabilities and HW struct to include needed
capabilities for upcoming Ethernet Switch (SR-IOV E-Switch).

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>