Remove duplicated shouldUncompressDex logic

shouldUncompressDex has already been computed and stored in
deviceProperties.UncompressDex, pass it to dexpreopter instead
of recomputing it.

Also add a stub for java libraries to set UncompressDex.

Test: no change to build.ninja
Change-Id: I663d9fbbe768a8dc9a97c7d456dd7a010f43162d