MIPS n64 support - continued...

1. On n64, use XKPHYS to map page table pages instead of KSEG0. Maintain
   just one freepages list on n64.

   The changes are mainly to introduce MIPS_PHYS_TO_DIRECT(pa),
   MIPS_DIRECT_TO_PHYS(), which will use KSEG0 in 32 bit compilation
   and XKPHYS in 64 bit compilation.

2. Change macro based PMAP_LMEM_MAP1(), PMAP_LMEM_MAP2(), PMAP_LMEM_UNMAP()
  to inline functions.

3. Introduce MIPS_DIRECT_MAPPABLE(pa), which will further reduce the cases
   in which we will need to have a special case for 64 bit compilation.

4. Update CP0 hazard definitions for CPU_RMI - the cpu does not need any
   nops

Reviewed by:	neel

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