cpu hotplug: convert more drivers (batch #4)

[Sebastian Andrzej Siewior]

Another small batch of drivers converted to the new hotplug state engine.
The whole series is also available at
  git://git.kernel.org/pub/scm/linux/kernel/git/bigeasy/hotplug-staging.git 
smp/hotplug

on top of v4.9-rc3.

Sebastian