net/mlx5: prepare Direct Verbs for Direct Rule

net/mlx5: prepare Direct Verbs for Direct Rule

This is the first patch of a series that is designed to enable the
Direct Rules API.

The main difference between Direct Verbs and Direct Rules from API
perspective is that in Direct Rules each action has it's own create
function and the object itself is of type void.

In this patch I'm adding functions to generate actions that currently
are done without create action, and I'm changing the action type to be
void *, so in next patches only the glue functions will need to change.

Signed-off-by: Ori Kam <orika@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>