cpuquiet: Enable cpuquiet by default

cpuquiet: Enable cpuquiet by default

Enable cpuquiet by default if autohotplug is enabled. Cpuquiet will now
replace autohotplug as the hotplugging infrastructure. The down_delay in
the balanced governor has also been increased to 2s from 500ms to match
a similar patch for autohotplug.

Change-Id: I36747af67c55547b3dee95f7d435f9ebc075d393
Signed-off-by: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-on: http://git-master/r/123851
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>