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

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: Randy Dunlap <[email protected]>
Cc:	Liam Girdwood <[email protected]>
Cc:	Mark Brown <[email protected]>
Signed-off-by: Mark Brown <[email protected]>