[media] MAINTAINERS: remove include/media/sh_veu.h

Apparently a copy-paste mistake; the similar sh_vou.h exists, and both
were added to MAINTAINERS by commit b618b69c ([media] MAINTAINERS: add
entries for sh_veu and sh_vou V4L2 drivers).

Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>