ASoC: sst_platform porting sst dsp driver interface as per latest in Greg's staging...

The interface between sst platform driver and intel sst dsp driver
have been changed in Greg's staging tree - next branch

This patch adds the interface changes compatible with the new interface
in Greg's staging tree

Signed-off-by: Harsha Priya <priya.harsha@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>