ixgbe: Add support for x550em_a 10G MAC type

ixgbe: Add support for x550em_a 10G MAC type

Orabug: 23177316

Add support for x550em_a 10G MAC type to the ixgbe driver. The new
MAC includes new firmware commands that need to be used to control
PHY and IOSF access, so that support is also added. The interface
supported is a native SFP+ interface.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 49425dfc74512bef9cf15eafb5de0fc98f024e20)
Signed-off-by: Brian Maly <brian.maly@oracle.com>