ASoC: Intel: Skylake: Rearrangement of code to cleanup SKL SST library

Skylake driver topology header/driver structure is referenced and used
in SST library which creates circular dependency. Hence the
rearrangement.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>