x86: early cpu_to_node fix in numa_64.c

Both of these references to cpu_to_node() can potentially occur
before the "late" cpu_to_node map is setup.  Therefore, they
should be changed to use early_cpu_to_node().

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>