media: MAINTAINERS: Add co-maintainer for the rkisp1 driver

As I'm actively working on the rkisp1 driver, I would like to volunteer
as a co-maintainer, mostly to make sure I get CC on patches.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Author: pinchartl

MAINTAINERS

@@ -18539,6 +18539,7 @@ F:	sound/soc/rockchip/rockchip_i2s_tdm.*
 
 ROCKCHIP ISP V1 DRIVER
 M:	Dafna Hirschfeld <dafna@fastmail.com>
+M:	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 L:	linux-media@vger.kernel.org
 L:	linux-rockchip@lists.infradead.org
 S:	Maintained