soundwire: intel: don't free dma_data in DAI shutdown

Now that the DMA data is allocated/freed in set_sdw_stream(), remove
free operations.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200630184356.24939-6-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/intel.c

@@ -806,14 +806,7 @@ intel_hw_free(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
 static void intel_shutdown(struct snd_pcm_substream *substream,
 			   struct snd_soc_dai *dai)
 {
-	struct sdw_cdns_dma_data *dma;
-
-	dma = snd_soc_dai_get_dma_data(dai, substream);
-	if (!dma)
-		return;
 
-	snd_soc_dai_set_dma_data(dai, substream, NULL);
-	kfree(dma);
 }
 
 static int intel_pcm_set_sdw_stream(struct snd_soc_dai *dai,