ASoC: SOF: uapi: remove unused sof header files

These header files are not used by kernel but internally by SOF firmware
and possibly by user space applications. If needed, they should be
included from include dir exported by SOF.

Signed-off-by: Jaska Uimonen <jaska.uimonen@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>