Default DMA-reachable address constraints to the whole address space, and

narrow these in the various ipXX_machdep.c. On IP22-like systems, narrow
them to 28 bit physical addresses, but unpessimize this by extending this
to 32 bit after autoconf, if no 28-bit limited hpc(4) device has been found.
Since physical memory on these systems start at 128MB, this means that Indigo
systems with more than 128MB memory will behave correctly (and so will Indy
systems with E++ boards and more than 128MB memory).

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