net/mlx5: allow jump to group lower than current

net/mlx5: allow jump to group lower than current

In current implementation, jump action is allowed only if target
group is higher than the current flow group,

This patch updates function flow_dv_validate_action_jump() to allow
jump action if target group is higher or lower than the current flow
group.
Target group equal to current flow group is still rejected.

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>