[ALSA] Kconfig: fix FW_LOADER dependencies

Move the FW_LOADER dependencies out of the *_FIRMWARE_IN_KERNEL entries
because these drivers use the firmware loader regardless of whether
there is an in-kernel firmware image.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>