Calling netif_carrier_{on,off} is sufficient.  There is no need
to duplicate the carrier state in a driver specific flag.
Acked-by: NEnrico Mioso <mrkiko.rs@gmail.com>
Signed-off-by: NBjørn Mork <bjorn@mork.no>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>