virtio: provide driver name in debug message

If a driver cannot be bound, provide the driver name in the debug
message. Now the debug message may look like this:

    (virtio-pci.l#0): virtio-rng driver not configured

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
1 file changed