io_uring zcrx: add MAINTAINERS entry

Same as [1] but also with netdev@ as an additional mailing list.
io_uring zero copy receive is of particular interest to netdev
participants too, given its tight integration to netdev core.

With this updated entry, folks running get_maintainer.pl on patches that
touch io_uring/zcrx.* will know to send it to netdev@ as well.

Note that this doesn't mean all changes require explicit acks from
netdev; this is purely for wider visibility and for other contributors
to know where to send patches.

[1]: https://lore.kernel.org/io-uring/989528e611b51d71fb712691ebfb76d2059ba561.1755461246.git.asml.silence@gmail.com/



Signed-off-by: David Wei <dw@davidwei.uk>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Mina Almasry <almasrymina@google.com>
[axboe: use correct io_uring tree URL]
Signed-off-by: Jens Axboe <axboe@kernel.dk>