mmap(9e), ddi_segmap_setup(9f) and related cleanups
I believe these are all functions that are part of the 32-bit legacy that never got cleaned up.
mmap(9e) shouldn't be used anymore, although it looks perhaps like /dev/mem is still using it.
Perhaps that driver should be updated.
We should finish telling drivers not to use mmap(9e). We should remove the support functions ddi_segmap_setup().
This was noticed while pulling on the thread that led from hat_getkpfnum().
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