msm_ion.c: fix zcache compatibility issues

Signed-off-by: Paul Reioux <reioux@gmail.com>
zcache-main: enable zcache by default

Signed-off-by: Paul Reioux <reioux@gmail.com>
zram: optimize for Android use

Signed-off-by: Paul Reioux <reioux@gmail.com>
Android ZRAM Optimizations: adapted from Samsung JF series kernel

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

Conflicts:
	arch/arm/kernel/process.c
zram swap: LMK and memcontrol update from Samsung SGS 4 update 2 source drop

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