Possible Bug: Incorrect DMA configuration in STM32 circular DMA sample

[Richy42]

The circular DMA sample contains the following DMA configuration for the NUCLEO-C031C6 board in
https://github.com/zephyrproject-rtos/zephyr/blob/main/samples/boards/st/uart/circular_dma/boards/nucleo_c031c6.overlay

<&dmamux1 3 52 (STM32_DMA_PERIPH_RX | STM32_DMA_MEM_8BITS | STM32_DMA_MODE_CYCLIC)>;

This MCU has only 3 channels (0 - 2)
The sample works when changed to:
<&dmamux1 2 52 (STM32_DMA_PERIPH_RX | STM32_DMA_MEM_8BITS | STM32_DMA_MODE_CYCLIC)>;

[JarmouniA]

Yes, you are correct, feel free to open a PR.