ASoC: Intel: bdw_rt286: Update file comments

ASoC: Intel: bdw_rt286: Update file comments

Drop redundant and update valuable comments within the file to increase
readability. This patch also revisits module information and kconfig
help strings.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20220620101402.2684366-13-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>