Revert "ASoC: mxs: correct 'direction' of device_prep_dma_cyclic"

This reverts commit dbec3b30a601791717bc5bb827e210c3b5d6e067 as it
should never have been applied to the ASoC tree at all, let alone 3.2.

sound/soc/mxs/mxs-pcm.c

@@ -136,7 +136,7 @@ static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
 			iprtd->period_bytes * iprtd->periods,
 			iprtd->period_bytes,
 			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
-			DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
+			DMA_TO_DEVICE : DMA_FROM_DEVICE);
 	if (!iprtd->desc) {
 		dev_err(&chan->dev->device, "cannot prepare slave dma\n");
 		return -EINVAL;