ARM: tegra: cpuquiet: Fix cpuquiet notifiers

The notifiers now properly fire on every cluster switch

Change-Id: I381301cf62f25b49532326cc7759696c7f6797b7
Signed-off-by: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>
cpuquiet: Runnable threads governor

[perf] The runnable threads governor only looks at the average number of
runnables in the system to make a decision when bringing cores
offline/online. First pass; tweaks thresholds and delays to reduce
decision latency to about ~50-70ms per core (from ~100-150ms per core)

Change-Id: Idd3b268a74a8f56ad3fc0e5c7f388174d1b6611f
Signed-off-by: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>