[LAD] alsaseq timestamping

[Dmitry Baikov]

Looking into seq sources helped.

On port subscription, one needs to call

                snd_seq_port_subscribe_set_time_update(sub, 1);
                snd_seq_port_subscribe_set_queue(sub, queue);
                snd_seq_port_subscribe_set_time_real(sub, 1);


Dmitry.