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This tests it out on a single test suite. If it looks good, it'll be
rolled out more broadly.

This will let us tear-down all the out-of-band flashing logic for
these devices, and replace it with on-demand pre-test flashing. The
latter being much simpler to maintain, having less moving parts, and
generally being more visible.

Bug: 1057152
Change-Id: Ic2fba3725b01bec2d3dedc4898e8acfe3ad5b22d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261702Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781967}