hw_random update

[Ian Molton]

Final (hopefully) version of my hw_random updates. The first patch updates the
hw_random core to use an appropriately sized and aligned buffer to receive
random data and the second patch adapts virtio-rng to use it, fixing a
previously unprovoked buffer alignment bug as a bonus.

[PATCH 1/2] hw_random: core updates to allow more efficient drivers
[PATCH 2/2] virtio: Convert virtio-rng to the new API
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