aries-common: use KitKat zRAM setting

CM's compcache has been removed, so we need to migrate to KitKat's
mechanism. The value is set to 64 MB for now, which is approximately
equal to the old 18% setting.

Change-Id: Ib780aed8c336cea5baf0f672e41179ef85790061
Merge "aries-common: use KitKat zRAM setting" into cm-11.0