Revert "Reduce RAM overprovision ratio."

This reverts commit 05d4dc8c1363f8169dbf56c554c008a4ab8fc150.

This doesn't work, despite docs to the contrary

Change-Id: I3ace0637573abbdef96db8c3a477d59f5bc170fd
Merge "Revert "Reduce RAM overprovision ratio."" into production