Android: Add missing implementation for QBluetoothServer

Change-Id: I6f52a99daf8fe24a07177faa89e23aa4ce17a129
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Document missing implementation for Object Push on Android.

Android doesn't have a public API for Object Push.

Change-Id: I21b067bb7d7c59cd21e4ebe80328ec1b06b435e7
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>