net/mlx5: Don't skip subfunction cleanup in case of error in module init

Clean SF resources if mlx5 eth failed to initialize.

Fixes: 1958fc2f

 ("net/mlx5: SF, Add auxiliary device driver")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>