ASoC: xtensa: 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: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20191210142614.19405-17-tiwai@suse.deSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/xtensa/xtfpga-i2s.c

@@ -390,7 +390,6 @@ static int xtfpga_pcm_hw_params(struct snd_soc_component *component,
 				struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *hw_params)
 {
-	int ret;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct xtfpga_i2s *i2s = runtime->private_data;
 	unsigned channels = params_channels(hw_params);
@@ -422,9 +421,7 @@ static int xtfpga_pcm_hw_params(struct snd_soc_component *component,
 		return -EINVAL;
 	}
 
-	ret = snd_pcm_lib_malloc_pages(substream,
-				       params_buffer_bytes(hw_params));
-	return ret;
+	return 0;
 }
 
 static int xtfpga_pcm_trigger(struct snd_soc_component *component,
@@ -472,7 +469,7 @@ static int xtfpga_pcm_new(struct snd_soc_component *component,
 	struct snd_card *card = rtd->card->snd_card;
 	size_t size = xtfpga_pcm_hardware.buffer_bytes_max;
 
-	snd_pcm_lib_preallocate_pages_for_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
+	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 				       card->dev, size, size);
 	return 0;
 }