SystemAPI RoleManager.getFinancialSms

1) telephoy calls hidden IRoleManager API getSmsMessagesForFinancialApp.
In order to mainline telephony, we should call stable system API
instead of hidden AIDL API.

2) decouple ISms from IFinancialSmsCallBack. Pass public
FinancialSmsCallback to RoleManager directly instead of going all
the way to ISms -> AppSmsManager

Bug: 138745655
Bug: 140908357
Test: atest android.telephony.cts.SmsManagerTest
Change-Id: Ibb25583cff46ac796c056c905424b9cc72e7a34e