ASoC: fix soc-core.c kernel-doc warning

Fix a kernel-doc warning in soc-core.c by adding notation for
@legacy_dai_naming.

../sound/soc/soc-core.c:2509: warning: Function parameter or member 'legacy_dai_naming' not described in 'snd_soc_register_dai'
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: alsa-devel@alsa-project.org
Link: https://lore.kernel.org/r/2215ee04-e870-5eea-a00c-9a5caf06faae@infradead.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-core.c

@@ -2498,6 +2498,8 @@ EXPORT_SYMBOL_GPL(snd_soc_unregister_dai);
  *
  * @component: The component the DAIs are registered for
  * @dai_drv: DAI driver to use for the DAI
+ * @legacy_dai_naming: if %true, use legacy single-name format;
+ * 	if %false, use multiple-name format;
  *
  * Topology can use this API to register DAIs when probing a component.
  * These DAIs's widgets will be freed in the card cleanup and the DAIs