Merge "Expose systemReady for SystemServer" am: 56564e061c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1640142

Change-Id: I4680cd76d6e5c074e291bddcf1bd4bd3871365a1
tree: c3ae0881339c5b6d904bbc73fd098ef1d0177219
  1. framework/
  2. service/
  3. OWNERS