staging/rdma/hfi1: Remove qpdev and qpn table from hfi1

Another change on the way to removing queue pair functionality from
hfi1. This patch removes the private queue pair structure and the table
which holds the queue pair numbers in favor of using what is provided
by rdmavt.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>