ASoC: compress: Use power efficient workqueue

There is no need for the power down work to be done on a per CPU workqueue
especially considering the fairly long delay before powerdown.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c
index d220150..53c9ecd 100644
--- a/sound/soc/soc-compress.c
+++ b/sound/soc/soc-compress.c
@@ -149,8 +149,9 @@
 					SND_SOC_DAPM_STREAM_STOP);
 		} else {
 			rtd->pop_wait = 1;
-			schedule_delayed_work(&rtd->delayed_work,
-				msecs_to_jiffies(rtd->pmdown_time));
+			queue_delayed_work(system_power_efficient_wq,
+					   &rtd->delayed_work,
+					   msecs_to_jiffies(rtd->pmdown_time));
 		}
 	} else {
 		/* capture streams can be powered down now */