IB/hfi1: Extract RSM map table init from QOS

Refactor the allocation, tracking, and writing of the RSM map table
into its own set of routines.  This will allow the map table to be
passed to multiple users to fill in as needed.  Start with the original
user, QOS.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>