media: include: v4l2-ctrl: Sort forward declarations

Before adding a new forward declaration to the v4l2-ctrls.h header file,
sort the existing ones alphabetically.
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

include/media/v4l2-ctrls.h

@@ -25,14 +25,14 @@
 
 /* forward references */
 struct file;
+struct poll_table_struct;
+struct v4l2_ctrl;
 struct v4l2_ctrl_handler;
 struct v4l2_ctrl_helper;
-struct v4l2_ctrl;
-struct video_device;
+struct v4l2_fh;
 struct v4l2_subdev;
 struct v4l2_subscribed_event;
-struct v4l2_fh;
-struct poll_table_struct;
+struct video_device;
 
 /**
  * union v4l2_ctrl_ptr - A pointer to a control value.