net/mlx5e: Delay skb->data access

Move mlx5e_handle_csum and eth_type_trans to the end of
mlx5e_build_rx_skb to gain some more time before accessing
skb->data, to reduce cache misses.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>