net/mlx4_core: Load the IB driver when the device supports IBoE

When checking what protocol drivers to load, the IB driver should be
requested also over Ethernet ports, if the device supports IBoE (RoCE).

Fixes: b046ffe5

 'net/mlx4_core: Load higher level modules according to ports type'
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>