i40evf: properly handle VLAN features

Correctly set the VLAN feature flags after setting the rest of the
netdev flags. And don't set them in hw_features, because these can't be
controlled by the VF driver.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>