sandbox: virtio: Disable the sandbox virtio blk device

This is not implemented so cannot actually be used to read blocks.
Disable it until it is implemented, to avoid causing a hang with EFI,
which probes every available BLK device.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Issue: https://source.denx.de/u-boot/u-boot/-/issues/37
1 file changed