net: ethernet: ti: davinci_cpdma: drop frame padding

Hence all users of davinci_cpdma switched to skb_put_padto() the frame
padding can be removed from it.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>