ARM: dts: stm32: Clean led-red node for stm32mp135f-dk-u-boot

Remove "color" property from led-red node which is not supported
by U-Boot.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
1 file changed