net/mlx4: Fix endianness issue in qp context params

Should take care of the endianness before assigning to params2 field.

Fixes: 53f33ae2 ("net/mlx4_core: Port aggregation upper layer interface")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>