More BUS_PROBE_NOWILDCARD sweeping. Some devices here (if_ath_ahb and siba)
resist easy conversion since they implement a great deal of their attach
logic inside probe(). Some of this could be fixed by moving it to attach(),
but some requires something more subtle than BUS_PROBE_NOWILDCARD.
A few last BUS_PROBE_NOWILDCARDs are in order.
A last BUS_PROBE_NOWILDCARD. Move setting the postfilter function into the
attach function probe shouldn't actually set anything up but just bid
on the device.