virtio: Set "start_on_kick" on virtio_set_features()

virtio: Set "start_on_kick" on virtio_set_features()

The guest feature is not set correctly on virtio_reset() and
virtio_init(). So we should not use it to set "start_on_kick" at that
point. This patch set "start_on_kick" on virtio_set_features() instead.

Fixes: badaf79cfdbd3 ("virtio: Introduce started flag to VirtioDevice")
Signed-off-by: Xie Yongji <[email protected]>
Reviewed-by: Greg Kurz <[email protected]>
Message-Id: <20190626023130[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>