Add support for Baytrail SST DSP IPC. This provides mechanism to communicate
with the DSP firmware.
Signed-off-by: NJarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: NLiam Girdwood <liam.r.girdwood@intel.com>
Signed-off-by: NMark Brown <broonie@linaro.org>