Log Message:
Add a patch which implements free-running timers on footbridge, as
found on cats and netwinder.  This gets a NetBSD/cats -current
install kernel booting again after the move to timecounters.  Before
this change, the emulated kernel would loop during the tlp0
attachment, inside delay().

Note, I'm guessing that a free-running timer should not generate
an interrupt on wrap (I don't have the hardware documentation).

Patch sent upstream.