Revert "Rework platform version to hide codenames."

Reason for revert: This causes a boot issue on Taimen (b/144480969). It wasn't caught by TreeHugger due to Taimen tests being disabled due to a different lab outage (b/144350336).

Change-Id: Ieff2d974e23c8e163a23eb168f3095c602dfe523

Bug: 144480969