Merge branch 'MSCC-PHY-RGMII-delays-and-VSC8502-support'

Vladimir Oltean says:

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MSCC PHY: RGMII delays and VSC8502 support

This series makes RGMII delays configurable as they should be on
Vitesse/Microsemi/Microchip RGMII PHYs, and adds support for a new RGMII
PHY.
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Signed-off-by: David S. Miller <davem@davemloft.net>