RDMA/siw: Fix setting active_{speed, width} attributes

RDMA/siw: Fix setting active_{speed, width} attributes

Make sure to set the active_{speed, width} attributes to avoid reporting
the same values regardless of the underlying device.

Fixes: 303ae1cdfdf7 ("rdma/siw: application interface")
Link: https://lore.kernel.org/r/20200218095911.26614-1-kamalheib1@gmail.com
Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Tested-by: Bernard Metzler <bmt@zurich.ibm.com>
Reviewed-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>