net: macb: remove unnecessary code

net: macb: remove unnecessary code

Commit 586890dec21b ("net: macb: add support for padding and fcs
computation") introduced a bug fixed by commit 9f7d61e74f9c ("net:
ethernet: cadence: fix socket buffer corruption problem"). Code removed
in this patch is not reachable at all so remove it.

Fixes: 586890dec21b ("net: macb: add support for padding and fcs computation")
Cc: Tristram Ha <Tristram.Ha@microchip.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>