staging/rdma/hfi1: pre-compute sc and sde for RC/UC QPs

Now that we have a multi-threaded work queue we precomputed and store the SC
and SDE on RC and UC QPs for faster access.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>