CameraService: Correct API2 error handling

- Add more error codes to the binder camera2 callbacks
- Translate HAL errors to callback errors
- When flushing, report failures for queued requests
- Treat stream config failure as nonfatal
- Send request errors when buffers aren't available for captures

Bug: 15524101
Bug: 14448494
Bug: 11272459
Bug: 17160301
Change-Id: I81aa54e805a9cce1cb8a6a9374549daa7666deb2