android: lowmemorykiller: disable ALMK during memory offline

Make lowmemorykiller aware of memory offline and disable adaptive
lowmemorykiller (ALMK) during the offline process. This reduces the
unnecessary kills during offlining. ALMK is meant to improve app
launch performances, thus not something to be run during offlining.

Change-Id: I3bde808cf18db76a787d0a4e864d1d8693f4885b
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>