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.orgSigned-off-by: H. Peter Anvin <hpa@zytor.com>