net/mlx5: fix encap/decap validation

net/mlx5: fix encap/decap validation

The encapsulation and decapsulation actions are divided into 2 types:
L2 and L3.
In order to configure L3 xcapsulation actions the user should use both
RAW_DECAP and RAW_ENCAP and setting the appropriated data sizes in
their action configuration structures.

The PMD flow validation wrongly didn't detect the RAW_DECAP
and RAW_ENCAP combination to distinguish between L3_DECAP and L3_ENCAP.
Thus, some xcapsulation related validation failed.
For example, when configuring modify header action before L3_DECAP.

Simplify the xcapsulation defines and fix the L3 xcapsulation detection
using the action configuration data sizes.

By the way, add the hairpin validation in this area.

Fixes: d85c7b5ea59f ("net/mlx5: split hairpin flows")
Fixes: 8ba9eee4ce32 ("net/mlx5: add raw data encap/decap to Direct Verbs")
Cc: stable@dpdk.org
Signed-off-by: Matan Azrad <matan@mellanox.com>
Acked-by: Ori Kam <orika@mellanox.com>