ixgbe: fix issue with SFP events with new X550 devices

ixgbe: fix issue with SFP events with new X550 devices

Orabug: 21918732

Add checks for systems that don't have SFP's to avoid incorrectly
acting on interrupts that are falsely interpreted as SFP events.
This also includes a modified check generating the EICR mask to be
more forward-looking.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 4ccc650cc845476885f73660b2e6335852f0f75c)
Signed-off-by: Brian Maly <brian.maly@oracle.com>