- While Netra X1 generally show no ill effects when registering a power

  fail interrupt handler, there seems to be either a broken batch of them
  or a tendency to develop a defect which causes this interrupt to fire
  inadvertedly. Given that apart from this problem these machines work
  just fine, add a tunable allowing the setup of the power fail interrupt
  to be disabled.
  While at it, remove the DEBUGGER_ON_POWERFAIL compile time option and
  make that behavior also selectable via the newly added tunable.
- Apparently, it's no longer a problem to call shutdown_nice(9) from within
  an interrupt filter (some other drivers in the tree do the same). So
  change the power fail interrupt from an handler in order to simplify the
  code and get rid of a !INTR_MPSAFE handler.
- Use NULL instead of 0 for pointers.

MFC after:	1 week

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