net/mlx4_core: make mlx4_profile const

Make these const as they are only used in a copy operation.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>