ASoC: amd: renoir: remove invalid kernel-doc comment

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.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/renoir/rn-pci-acp3x.c

@@ -20,7 +20,7 @@ static int acp_power_gating;
 module_param(acp_power_gating, int, 0644);
 MODULE_PARM_DESC(acp_power_gating, "Enable acp power gating");
 
-/**
+/*
  * dmic_acpi_check = -1 - Use ACPI/DMI method to detect the DMIC hardware presence at runtime
  *                 =  0 - Skip the DMIC device creation and return probe failure
  *                 =  1 - Force DMIC support