Include the second VLAN HLEN into account when computing the maximum
MTU size as other drivers do.

Fixes: 0c8493d9 ("i40e: add XDP support for pass and drop actions")
Signed-off-by: NJason Xing <kernelxing@tencent.com>
Reviewed-by: NAlexander Duyck <alexanderduyck@fb.com>
Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel)
Signed-off-by: NTony Nguyen <anthony.l.nguyen@intel.com>