[ALSA] ASoC very minor coding style fix for snd_soc_new_pcms()

This very minor patch fixes the snd_soc_new_pcms() function to comply
with the kernel coding style.

Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>