armv7m: Make cpu object a child of the armv7m container

Rather than just creating the CPUs with object_new, make them child
objects of the armv7m container. This will allow the cluster code to
find the CPUs if an armv7m object is made a child of a cluster object.
object_new_with_props() will do the parenting for us.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20190121185118.18550-3-peter.maydell@linaro.org

hw/arm/armv7m.c

@@ -158,7 +158,12 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
 
     memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
 
-    s->cpu = ARM_CPU(object_new(s->cpu_type));
+    s->cpu = ARM_CPU(object_new_with_props(s->cpu_type, OBJECT(s), "cpu",
+                                           &err, NULL));
+    if (err != NULL) {
+        error_propagate(errp, err);
+        return;
+    }
 
     object_property_set_link(OBJECT(s->cpu), OBJECT(&s->container), "memory",
                              &error_abort);