buildfix: asoc edma

Get rid of compile warning:

  CC      sound/soc/davinci/davinci-pcm.o
  sound/soc/davinci/davinci-pcm.c: In function 'davinci_pcm_dma_request':
  sound/soc/davinci/davinci-pcm.c:147: warning: passing argument 2 of 'edma_alloc_channel' from incompatible pointer type
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

sound/soc/davinci/davinci-pcm.c

@@ -109,7 +109,7 @@ static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
 		prtd->period = 0;
 }
 
-static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
+static void davinci_pcm_dma_irq(unsigned lch, u16 ch_status, void *data)
 {
 	struct snd_pcm_substream *substream = data;
 	struct davinci_runtime_data *prtd = substream->runtime->private_data;