Make privileged apps always keep uncompressed dex files.

To ensure the verified boot work does not make ART run
dex code uncompressed in memory, make the build system
generate uncompressed dex files in APKs.

The alignment of STORE files in an APK is already handled.

bug: 30972906
bug: 63920015

Test: doing zipinfo on the produced apks after build.
Change-Id: I0ccdeae5d674b2a409a1343c4a14699c7bf0defb