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

make kernel / userspace mode switchable

Change-Id: I59cb63b186df471dba4132b045e602490bb353cd
Signed-off-by: Paul Reioux <reioux@gmail.com>
kernel/power/powersuspend: default to userspace for now

Change-Id: Ice855473bd4871253dc1945072aaa5efbaaee5e8
Signed-off-by: Paul Reioux <reioux@gmail.com>