zram: optimize for Android use

Signed-off-by: Paul Reioux <reioux@gmail.com>
zram swap: LMK and memcontrol update from Samsung SGS 4 update 2 source drop

Signed-off-by: Paul Reioux <reioux@gmail.com>
staging: lowmemorykiller: fix uninitialized variable
staging:lowmemorykiller: fix lowmemorykiller according with lastest CAF updates