dt-bindings: arm: stm32: add compatible for stm32h747i-disco board

dt-bindings: arm: stm32: add compatible for stm32h747i-disco board

The board includes an STM32H747XI SoC with the following resources:
 - 2 Mbytes Flash
 - 1 MByte SRAM
 - LCD-TFT controller
 - MIPI-DSI interface
 - FD-CAN
 - USB 2.0 high-speed/full-speed
 - Ethernet MAC
 - camera interface

Detailed information can be found at:
https://www.st.com/en/evaluation-tools/stm32h747i-disco.html

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250427074404.3278732-3-dario.binacchi@amarulasolutions.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>