ASoC: Intel: atom: fix kernel-doc

Fix W=1 warnings. The kernel-doc format was probably never supported,
fix information as needed.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200701183716.83314-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>