optimize m68k writeback():

- it can really only be invoked from trap(), not from other userret() callers,
  so it is safe to hardcode its docachepush parameter to 1.
- use pmap_kenter_pa()/pmap_kremove() for the temporary mapping instead of
  pmap_enter()/pmap_remove().

optimize m68k userret():
- define PROC_PC for m68k systems.
- only check want_resched when processing T_ASTFLT traps.
- provide two version of userret(), one which will also invoke writeback()
  on 68040 if required, which is only invoked from trap(), and regular
  userret(). This speeds up system call returns.

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