kernel/numa.c: Move logging out of numa.h

[ Upstream commit d7a73e3f ]

Moving these stub functions to a .c file means we can kill a sched.h
dependency on printk.h.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Stable-dep-of: f9f67e5a ("x86/numa: Fix SRAT lookup of CFMWS ranges with numa_fill_memblks()")
Signed-off-by: Sasha Levin <sashal@kernel.org>