Add Callback to notify changes of barring status

-Create a BarringInfo class to pass Barring information
 from HAL to PhoneStateListener.
-Add a multi-callback registrant so that ServiceStateTracker
 and potentially DcTracker can also listen to barring info in
 the future.

Bug: 143226991
Test: make update-api && make && atest BarringInfoTest
Change-Id: I08240259f3142beeca991238bf705236f0303954