dts: arm: stm32U5 add a DMA node for the GPDMA1 instance
dts: arm: stm32U5 add a DMA node for the GPDMA1 instance

This commit defines the GPDMA peripheral for the stm32U5.
This dma is of a new type with 16 channels and 114 requests.

Signed-off-by: Francois Ramu <b83adc7f8a23ee911a37fcb61c4033581aae0b7a@st.com>

finikorg/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr