If the rootduid matches a softraid chunk of a bootable softraid volume,

map the rootduid to the DUID of the softraid volume. This means that
regardless of where the kernel is loaded from we always get the softraid
volume as the root device, providing we booted from one of its chunks.
If we boot from any other disk then the rootduid remains unchanged.

With this diff it is now possible to have the root filesystem on softraid,
however at this stage the kernel still needs to be loaded from a separate
FFS partition.

ok deraadt@

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