cpuquiet: Support X cpus for runnables governor

cpuquiet: Support X cpus for runnables governor

Runnables govenror will now work properly for any number of cpus as
defined by NR_CPUS. Switched the ordering of nr_run_threshold init to
ensure that array is initialized correctly to UINT_MAX for NR_CPUS-1 cpu.

Bug 1427140

Change-Id: Ic612406ceaf80dd7e0b6693906df339f8b6512aa
Signed-off-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-on: http://git-master/r/369016
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>