ASoC: sdw-mockup: use helper function

Current ASoC has many helper function.
This patch use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87v8knea4b.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sdw-mockup.c

@@ -57,10 +57,7 @@ static int sdw_mockup_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
 	stream->sdw_stream = sdw_stream;
 
 	/* Use tx_mask or rx_mask to configure stream tag and set dma_data */
-	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
-		dai->playback_dma_data = stream;
-	else
-		dai->capture_dma_data = stream;
+	snd_soc_dai_dma_data_set(dai, direction, stream);
 
 	return 0;
 }