libcamera: Replace toString with operator<<() for geometry classes

Now that geometry classes implement the stream formatting operator<<(),
use it instead of the toString() function.

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

src/libcamera/pipeline/rkisp1/rkisp1_path.cpp

@@ -119,7 +119,7 @@ int RkISP1Path::configure(const StreamConfiguration &config,
 
 	LOG(RkISP1, Debug)
 		<< "Configured " << name_ << " resizer input pad with "
-		<< ispFormat.toString() << " crop " << rect.toString();
+		<< ispFormat.toString() << " crop " << rect;
 
 	ispFormat.size = config.size;