ASoC: dmaengine: Use standard pcm_format_to_bits() macro

The conversion from PCM format type to bits needs an explicit cast,
and it'll be uglier.  Since we have a standard macro for that, let's
use it instead.

This patch fixes the sparse warning:
  sound/soc/soc-generic-dmaengine-pcm.c:200:63: warning: restricted snd_pcm_format_t degrades to integer
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-generic-dmaengine-pcm.c

@@ -188,7 +188,7 @@ static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substrea
 			case 32:
 			case 64:
 				if (addr_widths & (1 << (bits / 8)))
-					hw.formats |= (1LL << i);
+					hw.formats |= pcm_format_to_bits(i);
 				break;
 			default:
 				/* Unsupported types */