x86: k8 numa register active regions later

Impact: cleanup

don't register early, so we don't need to clear actived regions if it fail
to get node hash shift or wild set in nb config.

also remove nodeids array that is not needed

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>