ASoC: pcm: Use wildcard msbits constraints

Use the new wildcard msbits constraints instead of installing a constraint
for each available sample format width.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>