mako_hotplug: code revision

  * clean it up to remove clutter on the main function
  * move all the hard-work to the cpu_revive and cpu_smash wrappers
for code clarity
  * for load spikes instead of relying on a single sample on 100% load
the counter needs to be >= 2 to avoid spurious online calls

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>