ASoC: codecs: nau8825: fix kernel-doc

v5.12-rc1 flags new warnings with make W=1, fix missing or broken
function descriptors.

sound/soc/codecs/nau8825.c:298: warning: wrong kernel-doc identifier
on line:
 * Ramp up the headphone volume change gradually to target level.

sound/soc/codecs/nau8825.c:358: warning: expecting prototype for This
func(). Prototype was for nau8825_intlog10_dec3() instead

sound/soc/codecs/nau8825.c:411: warning: wrong kernel-doc identifier
on line:
 * computes cross talk suppression sidetone gain.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210301174639.117017-1-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/nau8825.c

@@ -295,7 +295,7 @@ static inline void nau8825_sema_reset(struct nau8825 *nau8825)
 }
 
 /**
- * Ramp up the headphone volume change gradually to target level.
+ * nau8825_hpvol_ramp - Ramp up the headphone volume change gradually to target level.
  *
  * @nau8825:  component to register the codec private data with
  * @vol_from: the volume to start up
@@ -347,8 +347,9 @@ static void nau8825_hpvol_ramp(struct nau8825 *nau8825,
 }
 
 /**
- * Computes log10 of a value; the result is round off to 3 decimal. This func-
- * tion takes reference to dvb-math. The source code locates as the following.
+ * nau8825_intlog10_dec3 - Computes log10 of a value
+ * the result is round off to 3 decimal. This function takes reference to
+ * dvb-math. The source code locates as the following.
  * Linux/drivers/media/dvb-core/dvb_math.c
  * @value:  input for log10
  *
@@ -408,7 +409,7 @@ static u32 nau8825_intlog10_dec3(u32 value)
 }
 
 /**
- * computes cross talk suppression sidetone gain.
+ * nau8825_xtalk_sidetone - computes cross talk suppression sidetone gain.
  *
  * @sig_org: orignal signal level
  * @sig_cros: cross talk signal level