usb: make sure device init happens *after* queue/thread creation

Albeit unlikely, usb_init_devide() could cause de transfer completion before queue creation and the core would push onto a uninitialized queue !

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30433 a1c6a512-1295-4272-9138-f99709370657

firmware/usb.c

@@ -675,8 +675,6 @@ void usb_acknowledge(long id)
 
 void usb_init(void)
 {
-    usb_init_device();
-
 #ifdef USB_FULL_INIT
     usb_enable(false);
 
@@ -690,6 +688,8 @@ void usb_init(void)
     tick_add_task(usb_tick);
 #endif
 #endif /* USB_FULL_INIT */
+
+    usb_init_device();
 }
 
 void usb_wait_for_disconnect(struct event_queue *q)