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: I4bfe00184fcfdf44b8d1866c5c550838b869c60a