1. decouple disconnectCause and preciseDisconnectCuase from
preciseCallState.
2. expose preciseCallState to SystemAPI and expose
onPreciseCallStateChanged to System API
3. remove/hide ImsReasonInfo from PreciseDisconnectCuase
4. expose DiconnectCuase and PreciseDisconnectCause to System API
5. new onDisconnectCauseChanged API on PhoneStateListener for CS call
and use ImsCallSessionListener for IMS call(imsreasonInfo)
6. add read_precise_phone_state to shell apk to enable GTS test
Bug: 119890559
Test: atest GtsGmscoreHostTestCases:TelephonyHostTest#testPhoneStateListener
Change-Id: If9256feff16b6bcaef1dfe194c2b0df2a48436b0
6a942d488a