RDMA/hfi1: Remove pointless driver version

Driver versions have long been forbidden in the RDMA subsystem. We removed
most of the code relating to them and have been very strict about not
allowing.  However there is some leftover versioning that we do not
need. Get rid of that.

Link: https://lore.kernel.org/r/20220520183717.48973.17418.stgit@awfm-01.cornelisnetworks.com


Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>