[ALSA] Fix SB-module dependency with PCI drivers

A few PCI drivers like ALS4000 and CS5530 require the SB16-codes.
This patch fixes / improves the dependency between SB modules and
PCI drivers.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>