lowmemorykiller: Use upstream version instead of Samsung's

Change-Id: I3c3870125a311ad4e7ccfcb1293a56bc00a196e3
Signed-off-by: Willi Ye <williye97@gmail.com>

Conflicts:
	arch/arm/configs/cyanogen_serrano_defconfig
	arch/arm/configs/msm8930_golden_att_defconfig
	arch/arm/configs/msm8930_golden_bmc_defconfig
	arch/arm/configs/msm8930_golden_vzw_defconfig
	arch/arm/configs/msm8930_loganre_defconfig
	arch/arm/configs/msm8930_melius_ktt_defconfig
	arch/arm/configs/msm8930_melius_lgt_defconfig
	arch/arm/configs/msm8930_melius_skt_defconfig