mlx5ib: Set default active width and speed when querying port.

Make sure the active width and speed is set in case the
translate_eth_proto_oper() function doesn't recognize the
current port operation mask.

Linux commit:
7672ed33c4c15dbe9d56880683baaba4227cf940

Submitted by: hselasky@
Approved by: hselasky (mentor)
MFC after: 1 week
Sponsored by: Mellanox Technologies