ASoC: nau8821: fix kernel-doc

ASoC: nau8821: fix kernel-doc

make W=1 reports warnings:

sound/soc/codecs/nau8821.c:1192: warning: Function parameter or member
'component' not described in 'nau8821_set_fll'

sound/soc/codecs/nau8821.c:1192: warning: Function parameter or member
'pll_id' not described in 'nau8821_set_fll'

sound/soc/codecs/nau8821.c:1192: warning: Function parameter or member
'source' not described in 'nau8821_set_fll'

sound/soc/codecs/nau8821.c:1192: warning: Excess function parameter
'codec' description in 'nau8821_set_fll'

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211025185933.144327-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>