Forward port bochs smp changes; rename smpdetect.c to smp.c.

Forward port bochs smp changes; rename smpdetect.c to smp.c.

Rename smpdetect.c to smp.c - the code does more than just cpu detection.
Don't probe cpu count on demand - schedule it during post.
Add logic to run wrmsr on all cpus.
Don't make mtrr setup specific to kvm - do it on all machines that
    have mtrr and msrs.
Detect cpu signature/features automatically in mptable.
Also, make sure acpi structures are packed.