ARM: dts: stm32: Drop remnants of upstream DT switch on DH STM32 DHSOM

Remove unused local DT copies after the OF_UPSTREAM conversion.

Fixes: cccb29fc1270 ("ARM: dts: stm32: Switch to using upstream DT on DH STM32 DHSOM")
Reported-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
3 files changed