[PATCH v3] virtio_blk: add VIRTIO_BLK_F_LIFETIME feature support

[Alvaro Karsz]

> Alvaro could you pls explain the use-case? Christoph has doubts that
> it's useful. Do you have a device implementing this?

Our HW exposes virtio devices, virtio block included.
The block device backend can be a eMMC/uSD card.

The HW can report health values (power, temp, current, voltage) and I
thought that it would be nice to be able to report lifetime values as
well.