RDMA/ipoib: Don't set constant driver version

There is no need to set driver version in in-tree kernel code.

Link: https://lore.kernel.org/r/20200220071239.231800-2-leon@kernel.org


Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>