x86_64: remove unused header file:

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86_64/node.h

@@ -1 +0,0 @@
-#include <asm-i386/node.h>