drivers: flash: stm32 qspi  driver setting dma priority
drivers: flash: stm32 qspi  driver setting dma priority

This adds a table to set the dma channel priority from the DTS
The config bits are converted through the table_priority
to match the DMA_Priority_level of the stm32cube HAL.
Fixes #46725

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

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