proc: enhance time-average nr_running stats

Add time-average nr_running to loadavg printout

Bug 958978

Change-Id:
I5c6904efb52a86f4964eb66c1576fc91f60f5b1d
Signed-off-by: Alex Frid
<afrid@nvidia.com>
(cherry picked from commit 86f3642)
Reviewed-on:
http://git-master/r/111636
Reviewed-by: Sai Gurrappadi
<sgurrappadi@nvidia.com>
Tested-by: Sai Gurrappadi
<sgurrappadi@nvidia.com>
Reviewed-by:
Automatic_Commit_Validation_User
Reviewed-by: Peter Boonstoppel
<pboonstoppel@nvidia.com>
Reviewed-by: Yu-Huan Hsu
<yhsu@nvidia.com>

idea is taken here -
https://github.com/faux123/android_kernel_sony_msm8974ab/commit/6672d24e97fe3d89ea3dc92d511ae75c4648791a