kvm/ioapic: dump real object instead of a fake one

When we do "info ioapic" for kvm ioapic, we were building up a temporary
ioapic object. Let's fetch the real one and update correspond to the
real object as well.

This fixes printing uninitialized version field in
ioapic_print_redtbl().

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1486106298-3699-2-git-send-email-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>