ASoC: Intel: Remove SST-legacy specific constants

As sound/soc/intel/haswell and /baytrail are no more, all SST-legacy
specific constants and registers are redundant so remove them.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@intel.com>
Link: https://lore.kernel.org/r/20201006064907.16277-11-cezary.rojewski@intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>