Revamp the newbus functions:

o  do not use the in* and out* functions. These functions are used by
   legacy drivers and thus must have ia32 compatible behaviour. Hence,
   they  need to have fences. Using these functions for newbus would
   then pessimize performance.
o  remove the conditional compilation of PIO and/or MEMIO support. It's
   a PITA without having any significant benefit. We always support them
   both. Since there are no I/O ports on ia64 (they are simulated by the
   chipset by translating memory mapped I/O to predefined uncacheable
   memory regions) the only difference between PIO and MEMIO is in the
   address calculation. There should be enough ILP that can be exploited
   here that making these computations compile-time conditional is not
   worth it. We now also don't use the read* and write* functions.
o  Add the missing *_8 variants. They were missing, although not missed.
   It's for completeness.
o  Do not add the fences that were present in the low-level support
   functions here. We're using uncacheable memory, which means that
   accesses are in program order. Change the barrier implementation
   to not only do a memory fence, but also an acceptance fence. This
   should more reliably synchronize drivers with the hardware. The
   memory fence enforces ordering, but does not imply visibility (ie
   the access does not necessarily have happened). This is what the
   acceptance deals with.

cpufunc.h cleanup:
o  Remove the low-level memory mapped I/O support functions. They are
   not used. Keep the low-level I/O port access functions for legacy
   drivers and add fences to ensure ia32 compatibility.
o  Remove the syscons specific functions now that we have moved the
   proper definitions where they belong.
o  Replace the ia64_port_address() and ia64_memory_address() functions
   with macros. There's a bigger change inline functions get inlined
   when there aren't function callsi and the calculations are simply
   enough to do it with macros.

Replace the one reference to ia64_memory address in mp_machdep.c to
use the macro.

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