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Now uses the new gclient var 'cros_boards_with_qemu_images' for DEPS
hooks as well as for building the data_deps for CrOS tests in GN.

Bug: 937821
Change-Id: Ifdd05f09a4200328a06028be86aeb22c8486c65c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285361Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786312}