ARM: dts: stm32: Rename mdio0 to mdio on DHCOR Testbench board
Replace "mdio0" node with "mdio" to match mdio.yaml DT schema.
Fixes: c8ce0dd75515b ("ARM: dts: stm32: Add DHCOR based Testbench board")
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
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