[media] MAINTAINERS: add exynos jpeg codec maintainers

Add Andrzej Pietrasiewicz and Jacek Anaszewski
as maintainers of drivers/media/platform/s5p-jpeg.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>