Merge branch 'realtek-phy-next'

Heiner Kallweit says:

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net: phy: realtek: add support for integrated 2.5Gbps PHY in RTL8125

This series adds support for the integrated 2.5Gbps PHY in RTL8125.
First three patches add necessary functionality to phylib.

Changes in v2:
- added patch 1
- changed patch 4 to use a fake PHY ID that is injected by the
  network driver. This allows to use a dedicated PHY driver.
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Signed-off-by: David S. Miller <davem@davemloft.net>