1. Docuemnt the scope of each callback event either apply to specific
subscriptions or not.
2. TelephonyRegistry store separate state e.g, precisecallstate, callAttribute
for each slot to support msim.
3. Add missing subscription match check when notify callbacks.
Bug: 130423985
Bug: 132181378
Test: atest CtsTelephonyTestCases:PhoneStateListenerTest
Merged-In: I4b014e00528a1f05e0b5f237229c561f8260e2bd
Change-Id: I4b014e00528a1f05e0b5f237229c561f8260e2bd
(cherry picked from commit d5deeb15e9)
2a5483ff77