config: enable memory group

Required for optimal functionality of ZRAM

http://source.android.com/devices/low-ram.html

Change-Id: I6dd7b4313cfc02ecfd0c487f0cfcef4ad11001c1
YPG1: config: enable memory group
Required for optimal functionality of ZRAM (for 4.4)

http://source.android.com/devices/low-ram.html