Import Android SDK Platform-Tools 28 [4477446]

/google/data/ro/projects/android/fetch_artifact \
    --bid 4477446 \
    --target sdk_phone_armv7-sdk_mac \
    sdk-repo-darwin-platform-tools-4477446.zip

Pkg.Revision has been modified to appear as 28.0.0

Change-Id: I309b79fdfa23b355faf9bcb0827ae685cb9fbf52