Long-due mips pmap potpourri:

- un-__P()ee.
- remove splimp() protection.
- allow pmap_extract() to return FALSE, dammit!
  XXX some code under arch/mips64 considers pa == 0 as failure, instead
      of checking the return value of pmap_extract(). Free commits.
- do not peek at uvm vm_page flags for ref/mod accounting, but use real
  MD flags in pv lists, and implement pmap_is_* and pmap_clear_*, so uvm
  (which knows better) does the right thing.
- debug code #ifdef PMAPDEBUG, not #ifdef DIAGNOSTIC.
- merge pmap_init() and pmap_pinit(), pmap_destroy() and pmap_release(),
  and update comments.
- better pmap_enter() logic, from NetBSD.
- do not use IS_VM_PHYSADDR() to know if we can use PHYS_TO_VM_PAGE()
  unchecked. Instead, compute PHYS_TO_VM_PAGE(), and check it against
  NULL. Saves a vm_physseg_find() call each time.
- pass vm_page_t to internal function whenever possible, rather than
  paddr_t, so that PHYS_TO_VM_PAGE() needs not be computed again.
- in the same way, do not compute PHYS_TO_KSEG0(foo) several times in a
  row (though PHYS_TO_KSEG0 is trivial).
- allow userspace address to cross 0x80000000 (may be useful in the
  future).
- implement PMAP_CANFAIL.

As a bonus:
- switch from HAVE_PMAP_PHYSSEG to HAVE_VM_PAGE_MD.
- remove dead (pre-pmap_pv_pool) code.
- KNF fixes.

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