ARM: dts: stm32: Add STM32MP13x SPL specific DT additions

ARM: dts: stm32: Add STM32MP13x SPL specific DT additions

Add DT additions required by U-Boot SPL to bring up the hardware.
This includes binman node to generate STM32 Image v2.0 which can be
booted by the BootROM, clock entries used by the SPL clock driver
during clock tree initialization, and syscon-reboot node so U-Boot
can reset the system without having to rely on PSCI call.

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Marek Vasut <marek.vasut@mailbox.org>