external_updater: update the proto definition. am: b56cc49ceb am: 1688ce3289 am: bbad5faf88 am: 368ba2b8ee

Original change: https://android-review.googlesource.com/c/platform/tools/external_updater/+/1913606

Change-Id: I50d68f4808ab4a2b6ae7e12bd45801f4b546188e