ASoC: mpc5200_dma: Don't overwrite ac97 device private_data

The mpc5200_dma overwrites the private_data field of the CODEC's AC'97
device with the DMA drivers private data, but never actually reads it again.
Given that the private_data field is supposed to be owned by the AC'97
driver, overwriting it may cause undefined behavior. This patch removes the
code that overwrites the field from the driver.
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/fsl/mpc5200_dma.c

@@ -327,9 +327,6 @@ static int psc_dma_new(struct snd_soc_pcm_runtime *rtd)
 			goto capture_alloc_err;
 	}
 
-	if (rtd->codec->ac97)
-		rtd->codec->ac97->private_data = psc_dma;
-
 	return 0;
 
  capture_alloc_err: