l2 tunnel and e-tag are not supported on the new x550em_a NICs, due
to missing checks for that mac type in the code.
This patch adds in the necessary conditional checks to enable the features
for x550em_a.
Fixes: 22e77d4501b8 ("ixgbe: support L2 tunnel operations")
Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
214b0619fc