Add support for x550em_a-based KR backplane devices.
Signed-off-by: Mark Rustad <mark.d.rustad@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit f572b2c4c86dcebe6b8684cbab03d9b2ea0d2ad6) Signed-off-by: Brian Maly <brian.maly@oracle.com>