Correctly (I hope) deallocate the if_arge RX buffer ring on arge_stop().

I had some interesting hangs until I realised I should try flushing the
DDR FIFO register and lo and behold, hangs stopped occuring.

I've put in a few DDR flushes here and there in case people decide to
reuse some of these functions.  It's very very likely they're almost
all superflous.

To test:

* Connect to a network with a _lot_ of broadcast traffic
* Do this:
  # while true; do ifconfig arge0 down; ifconfig arge0 up; done

This fixes the mbuf exhaustion that has been reported when the interface
state flaps up/down.

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