MSIM: Phone account related changes

- Do not set "always ask" if only one account present
- Use voice subId from SIM Settings as default outgoing account
- Enable debug log level

Conflicts:
AndroidManifest.xml
src/com/android/server/telecom/PhoneAccountRegistrar.java
src/com/android/server/telecom/TelecomBroadcastReceiver.java
Change-Id: I9e7b16f20c357f8d3ceedfba781bc893d11c39ea