ASoC: fix kernel-doc warnings in sound/soc/soc-ops.c

Fix kernel-doc warnings in soc-ops.c:

..//sound/soc/soc-ops.c:415: warning: No description found for parameter 'ucontrol'
..//sound/soc/soc-ops.c:415: warning: Excess function parameter 'uinfo' description in 'snd_soc_put_volsw_sx'
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Cc:	Liam Girdwood <lgirdwood@gmail.com>
Cc:	Mark Brown <broonie@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/soc-ops.c

@@ -404,7 +404,7 @@ EXPORT_SYMBOL_GPL(snd_soc_get_volsw_sx);
 /**
  * snd_soc_put_volsw_sx - double mixer set callback
  * @kcontrol: mixer control
- * @uinfo: control element information
+ * @ucontrol: control element information
  *
  * Callback to set the value of a double mixer control that spans 2 registers.
  *