Merge branch 'rswitch-SERDES-PHY-init'

Yoshihiro Shimoda says:

====================
net: renesas: rswitch: Modify initialization for SERDES and PHY

- My platform has the 88x2110.
- The MACTYPE setting of strap pin on the platform is SXGMII.
- However, we realized that the SoC cannot communicate the PHY with SXGMII
  because of mismatching hardware specification.
- We have a lot of boards which mismatch the MACTYPE setting.

So, I would like to change the MACTYPE as SGMII by software for the platform.

The patch [1/5] sets phydev->host_interfaces by phylink for Marvell PHY
driver (marvell10g) to initialize the MACTYPE.

- The patch [1/5] siplifies the rswitch driver.
- The patch [2/5] converts to phy_device from phylink.
- The patch [3/5] sets phydev->host_interfaces from this driver without
  any new functions of phylib.
- The patch [4/5] adds phy_power_on() calling to initialize the Ethernet
  SERDES PHY driver (r8a779f0-eth-serdes) for each channel.
- The patch [5/5] adds "max-speed" handling.

Changes from v4:
https://lore.kernel.org/all/20230127142621.1761278-1-yoshihiro.shimoda.uh@renesas.com/
 - No modification of phylink API.
 - Convert to phylib instead of phylink.
 - Add "max-speed" handling.

Changes from v3:
https://lore.kernel.org/all/20230127014812.1656340-1-yoshihiro.shimoda.uh@renesas.com/
 - Keep a pointer of "port" and more simplify the code.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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