Commit 15226522304868a8312a84f8ff549fdc6bbf54db was implemented strictly
for x86. Unfortunately one of the pieces was mixed into a common area
breaking other architectures. For now disable these bits on !x86, this
should be cleaned up later.
I'm fine with this, if in the future other arches require some arch specific stuff to be executed at a similar place we could introduce an arch-specific hook (ie: xen_cpu_resumed or some such, I'm bad at naming).