Hotplug / TSC cleanup and fixing

[Zachary Amsden]

Greatly simplified version of the patches; allocate and dealloc
all required structs at module load and unload time.

Clarification: per_cpu(var, cpu) does indeed work for not-present CPUs;
  the allocations for module specific per-cpu variables are done at module
  load and unload time, while the per_cpu chunks are setup for all possible
  CPUs at boot time.

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