When compiled-in, make sure the sound system has initialized
before these drivers do.

Reported by Adrian Bunk <bunk@stusta.de>

(The right fix would be to make the sound core use "subsys_initcall()"
and thus initialize before all normal drivers, but this is the quick
and limited safe fix for 2.6.15).
Signed-off-by: Linus Torvalds <torvalds@osdl.org>