staging/rdma/hfi1: Remove modify queue pair from hfi1

In addition to removing the modify queue pair verb from hfi1 we also
remove ancillary functions which existed only for modify queue pair and
are also already present in hfi1.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>