Don't process broadcasts until really ready.

Someone started setting mSystemReady too early, when we really want
to know SystemServer's real ready state.  Add a variable to track
that, and don't process broadcasts until that's set.

Bug: 78020762
Test: builds, boots
Change-Id: I65213e46044c95fb0a8a4b09b9aa463bb15c1844
2 files changed