MAINTAINERS: delete email for Anton Sviridenko

The email address bounced. I couldn't find a newer one in recent git
history, so update MAINTAINERS accordingly.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

MAINTAINERS

@@ -20741,7 +20741,6 @@ F:	include/uapi/rdma/rdma_user_rxe.h
 
 SOFTLOGIC 6x10 MPEG CODEC
 M:	Bluecherry Maintainers <maintainers@bluecherrydvr.com>
-M:	Anton Sviridenko <anton@corp.bluecherry.net>
 M:	Andrey Utkin <andrey_utkin@fastmail.com>
 M:	Ismael Luceno <ismael@iodev.co.uk>
 L:	linux-media@vger.kernel.org
@@ -22953,7 +22952,6 @@ F:	tools/testing/selftests/turbostat/
 
 TW5864 VIDEO4LINUX DRIVER
 M:	Bluecherry Maintainers <maintainers@bluecherrydvr.com>
-M:	Anton Sviridenko <anton@corp.bluecherry.net>
 M:	Andrey Utkin <andrey.utkin@corp.bluecherry.net>
 M:	Andrey Utkin <andrey_utkin@fastmail.com>
 L:	linux-media@vger.kernel.org