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/a9mpcore.c b/hw/a9mpcore.c
index 19de12b..03b128c 100644
--- a/hw/a9mpcore.c
+++ b/hw/a9mpcore.c
@@ -238,9 +238,9 @@
     .class_init    = a9mp_priv_class_init,
 };
 
-static void a9mp_register_devices(void)
+static void a9mp_register_types(void)
 {
     type_register_static(&a9mp_priv_info);
 }
 
-device_init(a9mp_register_devices)
+type_init(a9mp_register_types)