ASoC: SOF: Intel: add .ack support for HDaudio platform - take 4

[plbossart]

Minor update based on @tiwai's feedback (c.f. https://lore.kernel.org/alsa-devel/s5hee8i43yj.wl-tiwai@suse.de/ )

diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c
index b3f78639c302..431ad0f7d2da 100644
--- a/sound/soc/sof/intel/hda-pcm.c
+++ b/sound/soc/sof/intel/hda-pcm.c
@@ -300,11 +300,11 @@ int hda_dsp_pcm_open(struct snd_sof_dev *sdev,
        }
 
        /*
-        * if we want the .ack to work, we need to prevent the status and
-        * control from being mapped
+        * if we want the .ack to work, we need to prevent the control from being mapped.
+        * The status can still be mapped.
         */
        if (hda_disable_rewinds)
-               runtime->hw.info |= SNDRV_PCM_INFO_NO_REWINDS | SNDRV_PCM_INFO_EXPLICIT_SYNC;
+               runtime->hw.info |= SNDRV_PCM_INFO_NO_REWINDS | SNDRV_PCM_INFO_SYNC_APPLPTR;
 
        /*
         * All playback streams are DMI L1 capable, capture streams need