Keep track of state overrides in TelephonyConnection.

There are a couple of places where we fake the TelephonyConnection's
state to Telecom for CDMA multi-party calling. Cleaning up this state
manipulation mechanism so that it happens from a central place and the
code is more readable.

BUG: 23754654
Change-Id: I7d991a6c8365b36bb535e7bbd7054de3b7ed5cc9
2 files changed