ASoC: Intel: sst: Add some helper functions

This patch adds helper functions like wait, creating ipc headers, shim
wrappers.

Signed-off-by: Subhransu S. Prusty <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

Author: Vinod Koul