[PATCH] mm: kvaddr_to_nid not used in common code

kvaddr_to_nid() isn't used in common code nor in i386 code.  Remove these
definitions.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>