[TG3]: Improve 5704S autoneg.
Improve 5704S autoneg logic by using a serdes_counter field to keep track of the transient states. This eliminates a 200 msec busy loop in the code. Autoneg will take its course without the driver busy waiting for it to finish. Signed-off-by: NMichael Chan <mchan@broadcom.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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