net/mlx4_en: tx_info allocated with kmalloc() instead of vmalloc()

Try to allocate using kmalloc_node() first, only on failure use
vmalloc()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>