net: sparx5: execute sparx5_vcap_init() on lan969x

The is_sparx5() check was introduced in an earlier series, to make sure
the sparx5_vcap_init() was not executed on lan969x, as it was not
implemented there yet. Now that it is, remove that check.

Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Reviewed-by: Jens Emil Schulz Østergaard <jensemil.schulzostergaard@microchip.com>
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>