camera2: refactor LEGACY mode error handling.

Bug: 17431462
Bug: 17407537

- Add Surface format/size validation during configure.
- Update exception error codes used in binder calls.
- Report dropped requests, frames, captures, and device
  errors in binder callback properly.
- Fixes CameraDeviceTest errors for incorrect metering
  rectangle weight in template tests.
- Fixes CameraDeviceTest errors for missing
  noiseReductionMode field in template tests.
- Implement flush call.

Change-Id: I0da803bccf2bfb9b4c0cf61208e160a86c577497