ASoC: cros_ec_codec: Use managed buffer allocation

Clean up the driver with the new managed buffer allocation API.
The superfluous snd_pcm_lib_malloc_pages() and
snd_pcm_lib_free_pages() calls are dropped.

Cc: Cheng-Yi Chiang <cychiang@chromium.org>
Cc: Benson Leung <bleung@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210142614.19405-18-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cros_ec_codec.c

@@ -918,7 +918,7 @@ static int wov_pcm_hw_params(struct snd_soc_component *component,
 	priv->wov_burst_read = true;
 	mutex_unlock(&priv->wov_dma_lock);
 
-	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
+	return 0;
 }
 
 static int wov_pcm_hw_free(struct snd_soc_component *component,
@@ -934,7 +934,7 @@ static int wov_pcm_hw_free(struct snd_soc_component *component,
 
 	cancel_delayed_work_sync(&priv->wov_copy_work);
 
-	return snd_pcm_lib_free_pages(substream);
+	return 0;
 }
 
 static snd_pcm_uframes_t wov_pcm_pointer(struct snd_soc_component *component,
@@ -950,7 +950,7 @@ static snd_pcm_uframes_t wov_pcm_pointer(struct snd_soc_component *component,
 static int wov_pcm_new(struct snd_soc_component *component,
 		       struct snd_soc_pcm_runtime *rtd)
 {
-	snd_pcm_lib_preallocate_pages_for_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC,
+	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_VMALLOC,
 				       NULL, 0, 0);
 	return 0;
 }