Revert "kthread: Ensure task isn't preempted before dequeue in kthread_parkme"

The right fix to address the issue has been pulled from upstream commit
"<9cd4f1a4e7a8> smp/hotplug: Move unparking of percpu threads to the
control CPU"

Change-Id: I3721ae1b7c8718c35fca1b7c7ef53ce80044d0cf
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>