lowmemorykiller: Don't wait more than one second for a process to die

If a process forked and the child process was killed by the
lowmemorykiller, the lowmemory killer would be disabled until
the parent process reaped the child or it died itself.

Change-Id: I49061da80aeae94aa8a244c1cc48b80bef6dc446
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Revert "Add BFQ iosched"

This reverts commit ab1e62cd0d682fdd19c8b6d3c44022b221e20dd4.

BFQ will be readded in the future.