libcamera: rkisp1: Maintain alphabetical order of forward declarations

Alphabetical order of Forward declarations should be maintained hence,
'class V4L2Subdevice' should come after 'class SensorConfiguration'.
Fix it.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>

src/libcamera/pipeline/rkisp1/rkisp1_path.h

@@ -26,8 +26,8 @@ namespace libcamera {
 
 class CameraSensor;
 class MediaDevice;
-class V4L2Subdevice;
 class SensorConfiguration;
+class V4L2Subdevice;
 struct StreamConfiguration;
 struct V4L2SubdeviceFormat;