zram: optimize for Android use adapted from Samsung JF Kernels

for use on HTC One

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:

	drivers/staging/android/lowmemorykiller.c

Conflicts:
	arch/arm/kernel/process.c
	drivers/staging/android/lowmemorykiller.c
	include/linux/sched.h