Move CallState and rename PRE_DIAL_WAIT.

CallState was a public API only being used by Telecom so I've moved it
into to Telecom and removed it from the public API.  The translation
from CallState to Call.STATE_* was happening on the public Call object
which wasn't ideal (Call.java shouldn't have to know that other
representations of state exist).  So I moved the translation into
InCallController.java and what we pass into ParcelableCall is now
Call.STATE_* constants.

Bug: 20532827
Bug: 20532435
Change-Id: I79ce36c7e971c1a49b857506c9a56cfe316069cf