Never strip and store dex files uncompressed when they are preopted on system.

In order for the runtime module to always be able to compile apps,
make sure we keep a copy of the dex files optimally.

Gated by a product flag if a product doesn't include the module yet.

Test: build
Change-Id: Ia9bba7f6f12f3400078a43d39ba4134cf8818399