Revert "sched: Migrate throttled tasks on HOTPLUG"

This reverts commit 7895e53bc4d1fe413b6f1f4127de86ca03a91c71.
Revert "sched: Prevent interactions with throttled entities"

This reverts commit 41aa425b45a2b22345898beb7f187bb2faebc27e.

Conflicts:
	kernel/sched.c