ASoC: Intel: Skylake: Remove return check for skl_codec_create()

Since skl_codec_create() always returns 0, make it return void and remove
return check.

Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>