virtio_net: Fix endian with virtio_net_ctrl_rss

Mark the fields of struct virtio_net_ctrl_rss as little endian as
they are in struct virtio_net_rss_config, which it follows.

Fixes: c7114b12 ("drivers/net/virtio_net: Added basic RSS support.")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Link: https://patch.msgid.link/20250321-virtio-v2-2-33afb8f4640b@daynix.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>