Default HOTPLUG helper tuning.

*When ROM MP activated it's set run_queue_poll_ms = 10
and that make cpu 0 to jump to max freq too much. when 20 it's idle
as expected.
*When ROM MP activated it's set running CPU GOV sampling_rate to 10000!
well that is not what i want, fix this too.
*Allow to mode sampling_rate on wake/sleep even if cortexbrain_cpu in not ON.
it's critical battery saver. or performance booster. need to control it.