hw/char/sh_serial: Convert to TypeInfo

QOM types are now registered using as TypeInfo via DEFINE_TYPES()
or type_init(). Update TYPE_SH_SERIAL, removing the empty QOM
instance_init/finalize handlers.

This was definitely wrong, because OBJECT_DEFINE_TYPE() is only
for cases where the class needs its own virtual methods or some
other per-class state in its own class struct.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20250124175053.74461-3-philmd@linaro.org>

hw/char/sh_serial.c

@@ -78,10 +78,6 @@ struct SHSerialState {
     qemu_irq bri;
 };
 
-typedef struct {} SHSerialStateClass;
-
-OBJECT_DEFINE_TYPE(SHSerialState, sh_serial, SH_SERIAL, SYS_BUS_DEVICE)
-
 static void sh_serial_clear_fifo(SHSerialState *s)
 {
     memset(s->rx_fifo, 0, SH_RX_FIFO_LENGTH);
@@ -441,14 +437,6 @@ static void sh_serial_unrealize(DeviceState *dev)
     timer_del(&s->fifo_timeout_timer);
 }
 
-static void sh_serial_init(Object *obj)
-{
-}
-
-static void sh_serial_finalize(Object *obj)
-{
-}
-
 static const Property sh_serial_properties[] = {
     DEFINE_PROP_CHR("chardev", SHSerialState, chr),
     DEFINE_PROP_UINT8("features", SHSerialState, feat, 0),
@@ -465,3 +453,14 @@ static void sh_serial_class_init(ObjectClass *oc, const void *data)
     /* Reason: part of SuperH CPU/SoC, needs to be wired up */
     dc->user_creatable = false;
 }
+
+static const TypeInfo sh_serial_types[] = {
+    {
+        .name           = TYPE_SH_SERIAL,
+        .parent         = TYPE_SYS_BUS_DEVICE,
+        .instance_size  = sizeof(SHSerialState),
+        .class_init     = sh_serial_class_init,
+    },
+};
+
+DEFINE_TYPES(sh_serial_types)