Revert "scheduler: Re-compute time-average nr_running on read"

This reverts commit 45bd52a81b6677d9c50300a3d75ef8c6103307da.
Revert "proc: enhance time-average nr_running stats"

This reverts commit 63e8894aa7530dde4e9187c239a24de46f3ad8b2.
Revert "scheduler: compute time-average nr_running per run-queue"

This reverts commit 7884696131883060c3f2a8b5cfbbcea8f13a6a88.
intelli_plug: refactor stats calculation code to be less intrusive

this is done for those kernels which do not have 100% source code available
and must use existing closed source modules such as wifi drivers

Signed-off-by: Paul Reioux <reioux@gmail.com>