make W=1 warning:

sound/soc/amd/renoir/rn-pci-acp3x.c:24: warning: wrong kernel-doc
identifier on line:
 * dmic_acpi_check = -1 - Use ACPI/DMI method to detect the DMIC
   hardware presence at runtime
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302205926.49063-6-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>