[media] sh_mobile_ceu_camera: add asynchronous subdevice probing support

Use the v4l2-async API to support asynchronous subdevice probing,
including the CSI2 subdevice. Synchronous probing is still supported too.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/media/sh_mobile_ceu.h b/include/media/sh_mobile_ceu.h
index 6fdb6ad..8937241 100644
--- a/include/media/sh_mobile_ceu.h
+++ b/include/media/sh_mobile_ceu.h
@@ -22,6 +22,8 @@
 	int max_width;
 	int max_height;
 	struct sh_mobile_ceu_companion *csi2;
+	struct v4l2_async_subdev **asd;	/* Flat array, arranged in groups */
+	int *asd_sizes;			/* 0-terminated array pf asd group sizes */
 };
 
 #endif /* __ASM_SH_MOBILE_CEU_H__ */