ASoC: Fix s3c-i2s-v2.c snd_soc_dai changes

Fix the build error in s3c-i2s-v2.c caused by
a change to the snd_soc_dai ops field.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>