greybus: camera: destroy data connection on link-config errors

Make sure to tear down the data connection also on failure to configure
the link by setting the data_connected flag immediately after creating
the connection.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>