android: camera_device: Report pipeline depth

Report the pipeline depth in the capture results if the pipeline
reports it.

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/android/camera_worker.h

@@ -25,6 +25,10 @@ public:
 	CaptureRequest(libcamera::Camera *camera, uint64_t cookie);
 
 	const std::vector<int> &fences() const { return acquireFences_; }
+	const libcamera::ControlList &metadata() const
+	{
+		return request_->metadata();
+	}
 
 	void addBuffer(libcamera::Stream *stream,
 		       libcamera::FrameBuffer *buffer, int fence);