ASoC: Intel: Reorganize the common dsp structure

We will add SKL platform data. So organizing common and platform
specific data helps.

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>