Revert "tuna: Update to ro.ksm.default"

This reverts commit 26c75d76b3d6a5f49ae559b87124fd4cd6689c57.
Revert "tuna: Enable KSM by default"

This reverts commit e1e6f6f8d90c225fed0cf951218146311d724048.
Revert "tuna: zRAM: Revert to default behaviour"

This reverts commit d0649d1227644d37a55c0df78a6e936590c3ca09.
Revert "tuna: Fixup activate zRAM"

This reverts commit dd2b36397287a8c661878ad1d6db5942fc0cfb40.
Revert "tuna: Enable ZRAM"

This reverts commit a4db983fa457b66c28102ca691b3972872545b2b.