[ALSA] sound: align device drivers menus

Modules: Sound Core,PCI drivers

AC97 Kconfig entries broke the ALSA device drivers menu,
so move them to a location where that won't happen,
enabling all device sub-menus to be presented together.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>