arm64: dts: renesas: r8a779g0: Use MDIO node for all AVB devices

Switch from defining the PHY inside the AVB node itself and create a
dedicated MDIO node for AVB0, the only AVB describing a PHY.  This is
needed as adding PHYs to AVB1 and AVB2 will require setting MDIO bus
parameters and thus requires a dedicated node.

Signed-off-by: Niklas Söderlund <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

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