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Update logic in gen_build_defs.py to match the SDK manifest data format
transition.

Bug: 951021
Change-Id: Ifaf5599e5cdecc9b32a6e285f3ca8ba36e9c48f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562759Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649728}