Import Android SDK Platform-Tools 28 [4386628]

/google/data/ro/projects/android/fetch_artifact \
    --bid 4386628 \
    --target sdk_phone_armv7-sdk_mac \
    sdk-repo-darwin-platform-tools-4386628.zip

Pkg.Revision has been modified to appear as 28.0.0

Change-Id: Ibdb45684e2c8acee89862dd144d8518b8ccf1f69