ALSA: pcm_format_to_bits strong-typed conversion

Add a function to handle conversion from snd_pcm_format_t
to bitwise with proper typing.

Change such conversions to use this function and silence sparse
warnings.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/aoa/soundbus/i2sbus/pcm.c

@@ -179,7 +179,7 @@ static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
 	 */
 	if (other->active) {
 		/* FIXME: is this guaranteed by the alsa api? */
-		hw->formats &= (1ULL << i2sdev->format);
+		hw->formats &= pcm_format_to_bits(i2sdev->format);
 		/* see above, restrict rates to the one we already have */
 		hw->rate_min = i2sdev->rate;
 		hw->rate_max = i2sdev->rate;