ASoC: Convert s3c-ac97 to pr_() macros

Could use dev_() but we'd have to remember the struct device somewhere
and it wouldn't make the logging clearer.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>