Better protection for system broadcast intents.

When the system sends broadcast intents, it's in a very authoritative
position, and many apps blindly trust the sender.  This is why we've
historically had the concept of "protected broadcasts" which can only
be sent by the system.

However, it's far too easy to send new broadcasts from the system
without adding them to the protected list.  This CL adds logic to help
catch those cases.  Currently it just logs the error and continues
sending the broadcast.

Based on boot analysis of a typical device, add 36 new protected
broadcasts.

Bug: 24571095
Change-Id: Ie2cc6b0b2026e67c64730af897e4eb3e0e8404f1