Revert "Revert "enable zRam the KitKat way""

This reverts commit ba7805381a8d7b75d0026284627ee59484b40d43.

Legacy compcache support was removed from CM, now this can be used

Conflicts:
	rootdir/init.qcom.rc
remove custom ksm values
re-enable JIT
audio: fix VoIP
enable qcom bionic optimizations