auxbus: Convert a use of qdev_set_parent_bus()

Convert qdev_set_parent_bus()/qdev_init_nofail() to qdev_realize();
recent commit "qdev: New qdev_new(), qdev_realize(), etc." explains
why.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200610053247.1583243-34-armbru@redhat.com>
2 files changed