stand/kshim: Replace bus_generic_attach with bus_attach_children

Fixes:	18250ec6c0 Replace calls to bus_generic_attach with bus_attach_children
Differential Revision:	https://reviews.freebsd.org/D48404

stand/kshim/bsd_kernel.c

@@ -205,16 +205,14 @@ bus_release_resource(device_t dev, int type, int rid, struct resource *r)
 	return (EINVAL);
 }
 
-int
-bus_generic_attach(device_t dev)
+void
+bus_attach_children(device_t dev)
 {
 	device_t child;
 
 	TAILQ_FOREACH(child, &dev->dev_children, dev_link) {
 		device_probe_and_attach(child);
 	}
-
-	return (0);
 }
 
 bus_space_tag_t

stand/kshim/bsd_kernel.h

@@ -646,7 +646,7 @@ int bus_release_resource(device_t, int, int, struct resource *);
 void bus_release_resources(device_t, const struct resource_spec *,
     struct resource **);
 struct resource *bus_alloc_resource_any(device_t, int, int *, unsigned int);
-int bus_generic_attach(device_t);
+void bus_attach_children(device_t);
 bus_space_tag_t rman_get_bustag(struct resource *);
 bus_space_handle_t rman_get_bushandle(struct resource *);
 u_long rman_get_size(struct resource *);