aoc/alsa: use system_highpri_wq for aoc_pcm_period_work We use workqueue to update the pcm hw_ptr. It needs higher priority to avoid updating the pcm hw_ptr too late. Bug: 208717360 Signed-off-by: millerliang <[email protected]> Change-Id: I84895f1086bb3ae12f85791f54df930914bd98ff