hw/avr: Realize AVRCPU qdev object using qdev_realize()

TYPE_AVR_CPU inherits TYPE_CPU, which itself inherits TYPE_DEVICE.
TYPE_DEVICE instances are realized using qdev_realize(), we don't
need to access QOM internal values.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Michael Rolnik <mrolnik@gmail.com>
Message-Id: <20211205224109.322152-1-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/hw/avr/atmega.c b/hw/avr/atmega.c
index 0608e2d..a34803e 100644
--- a/hw/avr/atmega.c
+++ b/hw/avr/atmega.c
@@ -233,7 +233,7 @@
 
     /* CPU */
     object_initialize_child(OBJECT(dev), "cpu", &s->cpu, mc->cpu_type);
-    object_property_set_bool(OBJECT(&s->cpu), "realized", true, &error_abort);
+    qdev_realize(DEVICE(&s->cpu), NULL, &error_abort);
     cpudev = DEVICE(&s->cpu);
 
     /* SRAM */