API Review PhoneManager -> TelecommManager. Rename methods (4/6)

PhoneManager
- handlePinMMI docs should explain what a Pin is and what MMI is
- rename isInAPhoneCall to isInCall
- rename showCallScreen to showInCallScreen
- merge this class into TelecommManager, we don't need both

Bug: 16960458

Change-Id: I3fcc21b6c54a5882e9fd5aa0a23ab953f3dc502b
1 file changed