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/usb-linux.c b/usb-linux.c
index e7fc9ec..5e95be6 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -1436,12 +1436,13 @@
     .class_init    = usb_host_class_initfn,
 };
 
-static void usb_host_register_devices(void)
+static void usb_host_register_types(void)
 {
     type_register_static(&usb_host_dev_info);
     usb_legacy_register("usb-host", "host", usb_host_device_open);
 }
-device_init(usb_host_register_devices)
+
+type_init(usb_host_register_types)
 
 USBDevice *usb_host_device_open(const char *devname)
 {