Asoc: Samsung: Add support for I2S runtime S2R

Asoc: Samsung: Add support for I2S runtime S2R

This patch adds runtime suspend to resume support for I2S

BUG=chrome-os-partner:12579
TEST=Tested by playing audio before suspend and after resume
using aplay command. I2S get suspended after probe and resume
upon audio playback.

Change-Id: Icd507188bbe2bb39e3bb9240ef6793b4ba937901
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/29991
Reviewed-by: Jon Kliegman <kliegs@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Commit-Ready: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>