libcamera: v4l2_videodevice: Remove Buffer interface

The Buffer interface is no longer in use and can be removed. While doing
so clean up the two odd names (dequeueFrameBuffer() and
queuedFrameBuffers_) that had to be used when adding the FrameBuffer
interface.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/pipeline/vimc.cpp

@@ -437,7 +437,7 @@ int VimcCameraData::init(MediaDevice *media)
 	if (video_->open())
 		return -ENODEV;
 
-	video_->frameBufferReady.connect(this, &VimcCameraData::bufferReady);
+	video_->bufferReady.connect(this, &VimcCameraData::bufferReady);
 
 	raw_ = new V4L2VideoDevice(media->getEntityByName("Raw Capture 1"));
 	if (raw_->open())