have a per-module switch to turn the symlinking optimizaiton off

The optimization is confusing syshealth because the modules will use
more memory when they are switched to the prebuilt (unbundled) or
updated via Play.

Let's have a per-module switch to control the behavior and turn it on
only for non-updatable modules like ART.

Bug: 149805758
Test: m
Change-Id: Ieb842c47f31f3b06e403b1e1f9e463c3e5524107