[ppc64 patch]

[Hollis Blanchard]

Hi Linus, please apply these two patches.

viodev->unit_address only carries 32 bits of information anyways, so there's no point in making it 64-bits wide.

To hotplug-remove virtual devices, we need vio_find_node() so we have a pointer to pass to vio_unregister_device().
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