virtio_balloon: convert to use virtio_find_vqs_info()

Instead of passing separate names and callbacks arrays
to virtio_find_vqs(), have one of virtual_queue_info structs and
pass it to virtio_find_vqs_info().

Suggested-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Message-Id: <20240708074814.1739223-17-jiri@resnulli.us>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>