net/mlx5: fix flow item flags bitmap

net/mlx5: fix flow item flags bitmap

In functions flow_dv_translate() and  flow_dv_validate(), the flow
items are scanned and each item is marked in item_flags bitmap.
The code handling some of the items was ported from another project,
where items are marked in a slightly different manner.

This patch fixes the setting of items in bitmap, adapting it to the
required manner.

Fixes: d53aa89aea91 ("net/mlx5: support matching on ICMP/ICMP6")
Fixes: 5865955ad994 ("net/mlx5: match GRE key and present bits")
Fixes: 2e4c987aad91 ("net/mlx5: validate Direct Rule E-Switch")
Cc: stable@dpdk.org
Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Xiaoyu Min <jackmin@mellanox.com>