Remove rules for building dex with dx

This is just to ensure no dex file is built with dx any more, cleaning
of the build rules from Jack optionality is still to be done.

Bug: 27218410

(cherry picked from commit 22313f2b2a4aba8d284be4324233379d95886e23)

Change-Id: I1e7f2f5dcc7f95a44f5ebf2e4ba99931ff3ba014
3 files changed