net/mlx5: fix RSS expansion for patterns with ICMP item

net/mlx5: fix RSS expansion for patterns with ICMP item

MLX5 PMD RSS expansion implementation added L4 UDP or TCP
headers after ICMP.
For example:
ETH / IPv4 / ICMP expanded into  ETH / IPv4 / ICMP / {UDP | TCP}
ETH / IPv6 / ICMPv6 expanded into  ETH / IPv6 / ICMPv6 / {UDP | TCP}

The patch updates PMD expansion scheme to handle ICMP and ICMPv6 types
as non-expandable for RSS.

Fixes: c7870bfe09dc ("ethdev: move RSS expansion code to mlx5 driver")
Cc: stable@dpdk.org
Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>