i40e: Replace X722 mac check in ethtool get_settings

i40e: Replace X722 mac check in ethtool get_settings

Orabug: 22342532

100M SGMII is only supported on X722.  Replace the mac check with
a feature flag check that is only set for the X722 device.

Change-ID: I53452d9af6af8cd9dca8500215fbc6ce93418f52
Signed-off-by: Catherine Sullivan <catherine.sullivan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from commit 48b1804ee3cdad7bf115666eb35edf12a734710f)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	drivers/net/ethernet/intel/i40e/i40e.h