net/mlx5: fix integrity conversion scheme

net/mlx5: fix integrity conversion scheme

RTE flow integrity API provides top-level packet validations.
RTE integrity bits are not always translated one-to-one to
hardware integrity bits.
For example RTE l3_ok and l4_ok integrity bits require 2 hardware
integrity bits each.

The patch fixes RTE l3_ok and l4_ok bits translation to match
ConnectX-6 hardware.

Fixes: 79f8952783d0 ("net/mlx5: support integrity flow item")
Cc: stable@dpdk.org
Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>