[slx-dmsetup] reintroduce linear 1:1 mapping of scratch device

Using the physical partition of NVMe directly led to errors when
creating the pool. As a workaround, we can "wrap" it in a linear target
of the same size. While this is superfluous in general, this works
around that specific problem. We can remove this workaround when we have
a better idea on how to fix pool creation on NVMes.

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