set IFQ_SET_MAXLEN to the number of slots on the tx ring, not 1.

this effectively enables tx mitigation on this chip. hrvoje popovski
tested it and discovered it adds about 20% to forwarding performance
on his test machine, and brings it more in line with ix(4) performance.

jmatthew thinks i copied setting it to 1 from myx, but myx resets
it to a proper value later on when it figures out what the chip is
capable of. how embarrassment.

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