Implement new method for handling SMS/MMS on the platform

Multi project change:
The changes in this project add the new (hidden) default sms application
setting to Settings.Secure and updates AppOps to support the concept
of an op defaulting to something other than allowed. OP_WRITE_SMS is set
to default to MODE_IGNORED.

Bug: 10449618
Change-Id: I37619784ac70c27cf9fbcbfcac1b263398bc4e01