MAINTAINERS: Remove se401 entry

Commit b287db11 ("se401: remove last V4L1 driver")
removed the files, remove the entry.

cc: Hans Verkuil <hverkuil@xs4all.nl>
cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>