[media] MAINTAINERS: Update solo6x10 entry

Re-add Ismael Luceno as co-maintainer (with personal email address).

Signed-off-by: Ismael Luceno <ismael@iodev.co.uk>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>