r8169: remove PCI DAC support
The old non-PCIe chip versions support PCI DAC, however this feature seems to be fragile, see comment in the PCI error handler. Therefore it's disabled per default. I think meanwhile it's time remove support for this legacy feature. This helps to reduce complexity of the driver. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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