net/mlx5e: Remove redundant macsec code

Currently macsec_fs_tx_create uses memset to set
two parameters to zeros when they are already
initialized to zeros.

Don't pass macsec_ctx to mlx5e_macsec_fs_add_rule
since it's not used.

Signed-off-by: Emeel Hakim <ehakim@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>