drivers: dma: stm32 Fix for STM32F1 SoCs
drivers: dma: stm32 Fix for STM32F1 SoCs

Not all STM32 parts have at least 5 DMA interrupt vectors for DMA2. In
particular, some STM32F1 XL-density devices only have 4 DMA2 interrupt
vectors, with Channels 4 and 5 sharing the same vector. Added
#if DT_INST_IRQ_HAS_IDX(1, 4) to prevent compiler errors on these SoCs.

Signed-off-by: Josh Hansen <d611f5fb060d8e2e3a03455c64e5f1a614c98b0a@gmail.com>

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