ASoC: SAMSUNG: Add Machine driver for S/PDIF PCM audio

This patch add S/PDIF machine driver to support S/PDIF PCM audio
on SMDKC100, SMDKC110 and SMDKV210 boards.

Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>