Push AUD_init down to devices

Now we can safely call AUD_init multiple times we can push it down to
individual audio devices, rather than having to pass it from the board
init.

Signed-off-by: Paul Brook <paul@codesourcery.com>
diff --git a/sysemu.h b/sysemu.h
index 9bb9fbc..25a7c32 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -241,8 +241,8 @@
     int enabled;
     int isa;
     union {
-        int (*init_isa) (AudioState *s, qemu_irq *pic);
-        int (*init_pci) (PCIBus *bus, AudioState *s);
+        int (*init_isa) (qemu_irq *pic);
+        int (*init_pci) (PCIBus *bus);
     } init;
 };