PM QoS: Add max online cpus as PM QoS parameter

Bug 894200

Change-Id: Ieb009a13c6ef9bca2388e234eb973d65a4e3a58b
Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-on: http://git-master/r/71034
Reviewed-by: Rohan Somvanshi <rsomvanshi@nvidia.com>
Tested-by: Rohan Somvanshi <rsomvanshi@nvidia.com>

Rebase-Id: R5791d3cb0bb66f3b8079f5a8af5fa758fb3c6705