virtio blk: fixed virtio block unit tests
virtio blk: fixed virtio block unit tests

Adjusted unit tests after autogeneration
of virtio block linux header.

Signed-off-by: Diana Popa <4240422768c1b315e51818a074064501037757cd@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker