Add the new 2X port width that is part of IB spec 1.3
Signed-off-by: NMichael Guralnik <michaelgur@mellanox.com>
Reviewed-by: NMajd Dibbiny <majd@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>