ramdisk: Configure zRAM and KSM

Based on recommended settings from: https://source.android.com/devices/low-ram.html

zRAM compression is currently set to 40%. Also enabled CAF's KSM deferred-timer feature for lower power consumption.
Revert "ueventd.pyramid: Remove permissions for 2D GPU"

This reverts commit 2e286d352558811bef1c440f57ec8428e76a7b0a.