Separate vdex versioning into two sections: verifier deps and dex code.

The layout is still the same, but this CL allows updating the cdex and
quickening encoding versions without having to update the verifier deps
version.

bug: 63920015
Test: test.py, dex2oat_test, oat_writer_test, oatdump_test

(cherry picked from commit 3a29355967f29999ba81b5772ec66d3ddee9ce3e)

Change-Id: I1b5b2cab30af18ab6ff2df6119913525330bec3c
8 files changed