Move label fetch logic into common utility class.

- Move logic from PhoneActionInflater and PhoneActionAltInflater into common
  utility method so it can be shared by PhoneNumberInteraction without going
  through account manager.
- Refactored InteractionType to be constant int instead of enum class.

Bug: 6993891
Change-Id: I91793fccc2ff193426d276dbc776c241cb930694
4 files changed