vsock/virtio_transport_common: remove unused virtio header includes

We can remove virtio header includes, because virtio_transport_common
doesn't use virtio API, but provides common functions to interface
virtio/vhost transports with the af_vsock core, and to handle
the protocol.

Reviewed-by: Stefan Hajnoczi <[e-mail]>
Signed-off-by: Stefano Garzarella <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/vmw_vsock/virtio_transport_common.c

···
 #include <linux/sched/signal.h>
 #include <linux/ctype.h>
 #include <linux/list.h>
-#include <linux/virtio.h>
-#include <linux/virtio_ids.h>
-#include <linux/virtio_config.h>
 #include <linux/virtio_vsock.h>
 #include <uapi/linux/vsockmon.h>