Revert "rq_stats: Doing rq_stats calculation in the scheduler tick"

This partially reverts commit b551c512c1674a4529fdaa5d7c7c2a77390ca316.
We don't need this since dyn_hotplug added.

Reported-by: moddingg33k <moddingg33k@gmx-topmail.de>
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>

Conflicts:
	sbuild.sh
Revert "tick-sched: recalculate sleep length each time it is requested"

This reverts commit 1c0a4128e47a7673e6e1347ce6dc40427ccc4a16.
cpufreq: ondemand: Cover the entire condition with unlikely

Missed that when backporting the code.

Reported-by: moddingg33k <moddingg33k@gmx-topmail.de>
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>