arm: dts: stm32mp: add stm32mp13 device tree for U-Boot

Compile the device tree of STM32MP13x boards and add the needed
U-Boot add-on.

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