Revert "aries-common: enable zRAM by default"

This reverts commit 8f8c9252a57726b15daa8b6aaaf9e5129475f156.

This patch is useless because this prop is not interpreted by Omni.
Better solution uploaded as well.

Change-Id: I7f8946270b74420b0d41382cc5d214d83f45722b