ALSA: pcmcia/pdaudiocf: fix kernel-doc

Fix W=1 warnings - add missing context parameter in description

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200702193604.169059-22-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>