dyn_hotplug: Add max_online tunable

Also fix an error in updating up_threshold tunable for I9000

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Check for busybox installation

Check for busybox installation and popup an error if missing/

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
ondemand: Fix default values for up_threshold for N4

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
2.9.5

Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>