[media] MAINTAINERS: V4L2: PLATFORM: Add entry for Renesas JPEG Processing Unit driver

Update RENESAS JPU driver maintainer in MAINTAINERS file.

Signed-off-by: Mikhail Ulyanov <mikhail.ulyanov@cogentembedded.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>