Revert "ARM: chronic-hotplug is born"

This reverts commit ae7e990ccb239334b884f0897c8f16789d8e9c48.
Revert "smp: patches from mainline 3.5 to hopefully help with hotplug efficiency"

This reverts commit cddf7d21ecff11accec0a0f23f207a6b301d347a.