Update notes for submitted changes

* cpufreq: ondemand: Use hotplug thread infrastructure
* cpufreq: cpu-boost: Use hotplug thread infrastructure
* stop_machine: Mark per cpu stopper enabled early
* stop_machine: Use smpboot threads
* stop_machine: Store task reference in a separate per cpu variable
* kthread: Prevent unpark race which puts threads on the wrong cpu
* smpboot: Allow selfparking per cpu threads
* hotplug: Fix UP bug in smpboot hotplug code
* smpboot: Provide infrastructure for percpu hotplug threads
* kthread: Implement park/unpark facility
* kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed
* kthread_worker: reorganize to prepare for flush_kthread_work() reimplementation
* smpboot, idle: Fix comment mismatch over idle_threads_init()
* smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init()
* smp, idle: Allocate idle thread for each possible cpu during boot
* smp: Provide generic idle thread allocation
* smp: Add generic smpboot facility