net/mlx5: DR, Remove 4 members from mlx5dr_ste_htbl to reduce memory

Remove chunk_size in struct mlx5dr_icm_chunk and use
chunk->size instead.

Remove ste_arr/hw_ste_arr/miss_list since they can be accessed
from htbl->chunk pointer, no need to keep a copy.

This commit reduces 28 bytes from struct mlx5dr_ste_htbl and its
size is 32 bytes now.

Signed-off-by: Rongwei Liu <rongweil@nvidia.com>
Reviewed-by: Shun Hao <shunh@nvidia.com>
Reviewed-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>