IB/core: Save the device attributes on the device structure

IB/core: Save the device attributes on the device structure

This way both the IB core and upper level drivers can access these cached
device attributes rather than querying or caching them on their own.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Orabug: 27687711
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
(cherry-picked from upstream 3e153a93a1c12e3354dd38cca414fb51a15136a2)
Reviewed-by: Håkon Bugge <haakon.bugge@oracle.com>