Patch 17:
virtio: follow virtio 1.2 spec, add more virtio status and device
Patch 18:
virtio: decoupling the transport layer and virtio device layer
1. Add virtio device api to decouple the transport layer and virtio
device layer.
2. Move the vrings info and virtqueue allocation/free to the
remoteproc transport layer;
3. Because 2, modify the rpmsg device also;
Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
