Merge branch 'mv88e6171_temps'

Andrew Lunn says:

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Add temperature reading and registers dump to mv88e6171

These patches centralize the temperature sensor reading code, and then
make use of it with the mv88e6171 which has a compatible
sensor. Additionally, support is added for reading the mv88e6171 via
ethtool.
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Signed-off-by: David S. Miller <davem@davemloft.net>