net: microchip: sparx5: Add ES0 VCAP model and updated KUNIT VCAP model

This provides the VCAP model for the Sparx5 ES0 (Egress Stage 0) VCAP.

This VCAP provides rewriting functionality in the egress path.

Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>