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>
diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index 79d6bda..6b7e2b5 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -182,7 +182,7 @@
 		runtime->hw.rate_max = chip->cur_rate;
 	}
 	if (chip->cur_format)
-		runtime->hw.formats = (1ULL << chip->cur_format);
+		runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
 	mutex_unlock(&opened_mutex);
 	chip->playback_substream = substream;
 	return 0;
@@ -201,7 +201,7 @@
 		runtime->hw.rate_max = chip->cur_rate;
 	}
 	if (chip->cur_format)
-		runtime->hw.formats = (1ULL << chip->cur_format);
+		runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
 	mutex_unlock(&opened_mutex);
 	chip->capture_substream = substream;
 	return 0;