libcamera: pipeline: rkisp1: Avoid copy assignment of V4L2 control map

Use the std::map::emplace() method to avoid unnecessary creation of an
empty V4L2ControlInfoMap folled by a copy assignment.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/pipeline/rkisp1/rkisp1.cpp

@@ -777,7 +777,7 @@ int PipelineHandlerRkISP1::start(Camera *camera)
 	};
 
 	std::map<unsigned int, V4L2ControlInfoMap> entityControls;
-	entityControls[0] = data->sensor_->controls();
+	entityControls.emplace(0, data->sensor_->controls());
 
 	data->ipa_->configure(streamConfig, entityControls);