qom: Unify type registration

Replace device_init() with generalized type_init().

While at it, unify naming convention: type_init([$prefix_]register_types)
Also, type_init() is a function, so add preceding blank line where
necessary and don't put a semicolon after the closing brace.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Cc: Anthony Liguori <anthony@codemonkey.ws>
Cc: malc <av1474@comtv.ru>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/usb-net.c b/hw/usb-net.c
index e211141..77e3278 100644
--- a/hw/usb-net.c
+++ b/hw/usb-net.c
@@ -1415,9 +1415,10 @@
     .class_init    = usb_net_class_initfn,
 };
 
-static void usb_net_register_devices(void)
+static void usb_net_register_types(void)
 {
     type_register_static(&net_info);
     usb_legacy_register("usb-net", "net", usb_net_init);
 }
-device_init(usb_net_register_devices)
+
+type_init(usb_net_register_types)