net/mlx5: Remove not-used IDA field from IPsec struct

The IDA halloc variable is not needed and can be removed.

Link: https://lore.kernel.org/r/cbecfbe01621e1b8bde746aa7f6c08497e656a25.1649232994.git.leonro@nvidia.com


Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>