Build: dexlayout build rules

This adds dexlayout to the build system. The dexlayout binary is from a
host build of ART (the Android RunTime) and will be populated by
.DEPS.

Bug: 875276
Change-Id: I1931bb2effe893b9e7962777b5e776e6e2490e8b
Reviewed-on: https://chromium-review.googlesource.com/1199583
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594658}