x86: clean up non-smp usage of cpu maps

Cleanup references to the early cpu maps for the non-SMP configuration
and remove some functions called for SMP configurations only.

Cc: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>