sysbus: apic: ioapic: convert to QEMU Object Model

This converts three devices because apic and ioapic are subclasses of sysbus.
Converting subclasses independently of their base class is prohibitively hard.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/milkymist-pfpu.c b/hw/milkymist-pfpu.c
index dc92eb6..b6ade5a 100644
--- a/hw/milkymist-pfpu.c
+++ b/hw/milkymist-pfpu.c
@@ -519,12 +519,19 @@
     }
 };
 
-static SysBusDeviceInfo milkymist_pfpu_info = {
-    .init = milkymist_pfpu_init,
-    .qdev.name  = "milkymist-pfpu",
-    .qdev.size  = sizeof(MilkymistPFPUState),
-    .qdev.vmsd  = &vmstate_milkymist_pfpu,
-    .qdev.reset = milkymist_pfpu_reset,
+static void milkymist_pfpu_class_init(ObjectClass *klass, void *data)
+{
+    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+    k->init = milkymist_pfpu_init;
+}
+
+static DeviceInfo milkymist_pfpu_info = {
+    .name = "milkymist-pfpu",
+    .size = sizeof(MilkymistPFPUState),
+    .vmsd = &vmstate_milkymist_pfpu,
+    .reset = milkymist_pfpu_reset,
+    .class_init = milkymist_pfpu_class_init,
 };
 
 static void milkymist_pfpu_register(void)