ASoC: Samsung: I2S: Add support for runtime S2R

This patch adds runtime suspend to resume support for I2S.
I2S clk is disabled at suspend and enabled at resume.

Signed-off-by: R. Chandrasekar <rcsekar@samsung.com>
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>