The ethernet0_rmii_pins_a pinmux change has no effect on any
DHSOM based hardware. The mco2_pins_a and mco2_sleep_pins_a
are both part of stm32mp15-pinctrl.dtsi . Drop both pinmux
changes.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>