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

make kernel / userspace mode switchable

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: aatjitra <aatjitra@gmail.com>

Conflicts:
	include/linux/powersuspend.h
	kernel/power/powersuspend.c