ASoC: SAMSUNG: Move PCM specific definitions into pcm.c

This patch moves PCM specific definitions, they doesn't need to be
shared, into 'pcm.c' from 'pcm.h'.

Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Jassi Brar <jassi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>