DeviceInitializerStatus API review changes

- Remove DeviceInitializerStatus.is*Status()
- Remove DeviceInitializerStatus.FLAG_STATUS_RESERVED
- Rename STATUS_STATE_CONNECT_BLUETOOTH_PROXY to
  STATUS_STATE_CONNECTING_BLUETOOTH_PROXY
- Rename STATUS_STATE_DISCONNECT_BLUETOOTH_PROXY to
  STATUS_STATE_DISCONNECTING_BLUETOOTH_PROXY

Bug: 20819590
Change-Id: I276c5674a36726d3681dcc29e896ad39888d116d
4 files changed