v4l2: camera: Merge getStreamConfig() with open()

The V4L2CameraProxy always calls V4L2Camera::getStreamConfig() right
after V4L2Camera::open(), and never afterwards. Simplify the code by
returning the initial configuration from V4L2Camera::open() and removing
V4L2Camera::getStreamConfig().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/v4l2/v4l2_camera.cpp

@@ -28,7 +28,7 @@ V4L2Camera::~V4L2Camera()
 	close();
 }
 
-int V4L2Camera::open()
+int V4L2Camera::open(StreamConfiguration *streamConfig)
 {
 	if (camera_->acquire() < 0) {
 		LOG(V4L2Compat, Error) << "Failed to acquire camera";
@@ -43,6 +43,7 @@ int V4L2Camera::open()
 
 	bufferAllocator_ = new FrameBufferAllocator(camera_);
 
+	*streamConfig = config_->at(0);
 	return 0;
 }
 
@@ -64,11 +65,6 @@ void V4L2Camera::unbind()
 	efd_ = -1;
 }
 
-void V4L2Camera::getStreamConfig(StreamConfiguration *streamConfig)
-{
-	*streamConfig = config_->at(0);
-}
-
 std::vector<V4L2Camera::Buffer> V4L2Camera::completedBuffers()
 {
 	std::vector<Buffer> v;