Make CREATOR columns read-only and auto set them in provider

- If an app (not SYSTEM or PHONE) tries to set CREATOR column when
inserting a message, it will be silently overridden by the true pacakge
name of the caller. Or if it tries to update the column, it will be
sliently dropped.
- Also fixed some PII issues

b/18393308

Change-Id: I4ac739b9a6cb78797f006f17c0eed3eeb64cc65e
4 files changed