staging: android: lowmemorykiller: Don't wait more than one second fo…

…r 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 HjÃ¸nnevÃ¥g <arve@android.com>