drivers/staging/android/lowmemorykiller.c: backport 3.4 lowmemorykiller

All commits up to:
    f8f24e6  lowmemorykiller: make default lowmemorykiller debug message useful

Signed-off-by: Dan Trifan <jimsth@gmail.com>
defconfig: 3.4 LMK entries

Signed-off-by: Dan Trifan <jimsth@gmail.com>