x86-32, numa: Rename @node_kva to @node_pa in init_alloc_remap()

init_alloc_remap() is about to do more and using _kva suffix for
physical address becomes confusing because the function will be
handling both physical and virtual addresses.  Rename @node_kva to
@node_pa.

This is trivial rename and doesn't cause any behavior difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1301955840-7246-6-git-send-email-tj@kernel.org
Signed-off-by: H. Peter Anvin <hpa@zytor.com>