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/dec_pci.c b/hw/dec_pci.c
index a40fbcf..37337bf 100644
--- a/hw/dec_pci.c
+++ b/hw/dec_pci.c
@@ -140,11 +140,11 @@
     .class_init    = pci_dec_21154_device_class_init,
 };
 
-static void dec_register_devices(void)
+static void dec_register_types(void)
 {
     type_register_static(&pci_dec_21154_device_info);
     type_register_static(&dec_21154_pci_host_info);
     type_register_static(&dec_21154_pci_bridge_info);
 }
 
-device_init(dec_register_devices)
+type_init(dec_register_types)