[media] MAINTAINERS: solo6x10, tw5864: add Anton Sviridenko

Anton Sviridenko is now in charge of drivers in Bluecherry.

Signed-off-by: Andrey Utkin <andrey.utkin@corp.bluecherry.net>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>