net/mlx5: fix vectorized mini-CQE prefetching

net/mlx5: fix vectorized mini-CQE prefetching

There was an optimization work to prefetch all the CQEs before
their invalidation. It allowed us to speed up the mini-CQE
decompression process by preheating the cache in the vectorized
Rx routine.

Prefetching of the next mini-CQE, on the other hand, showed
no difference in the performance on x86 platform. So, that was
removed. Unfortunately this caused the performance drop on ARM.

Prefetch the mini-CQE as well as all the soon to be
invalidated CQEs to get both CQE and mini-CQE on the hot path.

Fixes: 28a4b96321a3 ("net/mlx5: prefetch CQEs for a faster decompression")
Cc: stable@dpdk.org
Signed-off-by: Alexander Kozyrev <akozyrev@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>