kernel/power/powersuspend: add back userpace control w/ default kernel control

make kernel / userspace mode switchable

Change-Id: I5a5052ef417554bdef48c785890d8d0fe1669d76
Signed-off-by: Paul Reioux <reioux@gmail.com>
Merge "kernel/power/powersuspend: add back userpace control w/ default kernel control" into android-4.4