Add more flexibility to the fast trap handlers mechanism:

- add the ability to deregister a fast trap handler.
- when registering a fast trap, provide an optional callback which will be
  invoked if we try to register a regular trap handler later; the callback
  will be responsible to replace the fast trap handler with a regular trap
  handler (and is allowed to fail).

Alter audioamd(4) to take advantage of this, so that it can share its
interrupt with stp(4) on SPARCclassic machines.

Problem found the hard way and fix tested by Jason George; discussed and
ok deraadt@

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