net/mlx5: fix memory region lookup

net/mlx5: fix memory region lookup

This patch reverts:
	commit 3a6f2eb8c5c5 ("net/mlx5: fix Memory Region registration")

Although granularity of chunks in a mempool is a cacheline, addresses are
extended to align to page boundary for performance reason in device when
registering a MR (Memory Region). This could make some regions overlap,
then can cause Tx completion error due to incorrect LKEY search. If the
error occurs, the Tx queue will get stuck. It is because buffer address is
compared against aligned addresses for Memory Region. Saving original
addresses of mempool for comparison doesn't create any overlap.

Fixes: b0b093845793 ("net/mlx5: use buffer address for LKEY search")
Fixes: 3a6f2eb8c5c5 ("net/mlx5: fix Memory Region registration")
Cc: stable@dpdk.org
Reported-by: Xueming Li <xuemingl@mellanox.com>
Signed-off-by: Xueming Li <xuemingl@mellanox.com>
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>