non-mainline telephony related AIDL refactor/decoupling

1. decouple IOnSubscriptionChangedListener AIDL from telephonyMainline
2. other refactor. moving APIs which will not be included in
telephony mainline to frameworks/base/core/java/android/telephony.
Moving internal classes like AIDL which will not be included in
telephony mainline to
framework/base/core/java/com/android/internal/telephony

Bug: 140908357
Test: Build & unit test
Change-Id: I9413ef758cceadd251d03f3b5ea1054cc48ef044
Merged-In: I9413ef758cceadd251d03f3b5ea1054cc48ef044