ASoC: SOF: Use high-priority workqueue for PCM period elapsed

The snd_sof_pcm_period_elapsed function currently schedules work on the
system-wide workqueue. This can lead to potential delays or jitter in
audio processing if the system workqueue is busy with other tasks.

To improve real-time performance and ensure timely processing of PCM
periods, we can use the system_highpri_wq instead of the default work
queue.

In performance testing, this change significantly reduced the observed
scheduling delays. For instance, under load(stressapptest -M 15000 -m
60), the maximum delay dropped from 9ms on the system workqueue to 5ms
on the dedicated high-priority workqueue.

Suggested-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Yu-Hsuan Hsu <yuhsuan@google.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://patch.msgid.link/20260730130445.8277-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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