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Add the ArcBootCompletedBroadcast feature flag to those exposed to
chromeos. This is needed by arcvm-launch to determine what commandline
parameters should be passed to the Android kernel.

BUG=b:136128691
TEST=dbus-send

Change-Id: I748b33ace2bab84c79075c9ee920e35bd7b56ff1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715398Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Chris Morin <cmtm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680187}