HALConfig: Raise ADC/DAC DMA priority.

During testing I noticed mbed OS will preempt or block DMA irq for
too long, causing DMA errors. ADC/DAC DMA should have the highest
priority since we don't have control over mbed.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

Author: iabdalkader

src/HALConfig.cpp

@@ -91,7 +91,7 @@ int hal_dma_config(DMA_HandleTypeDef *dma, IRQn_Type irqn, uint32_t direction) {
     }
 
     // NVIC configuration for DMA Input data interrupt.
-    HAL_NVIC_SetPriority(irqn, 1, 0);
+    HAL_NVIC_SetPriority(irqn, 0, 0);
     HAL_NVIC_EnableIRQ(irqn);
 
     return 0;