IB/qib: Remove qpt_mask global

There is no need to have a global qpt_mask as that does not support the
multiple chip model which qib has. Instead rely on the value which
exists already in the device data (dd).

Fixes: 898fa52b "IB/qib: Remove qpn, qp tables and related variables from qib"
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>