ASoC: SMDKV310: Add I2S support

Add ASoC machine driver for SMDKV310/C210 boards that have
a WM8994 attached to I2S-0.

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