IRDA: fix NVIC setup (#592)

LF-RFID uses HAL functions to deinit TIM2, which also
disables NVIC for TIM2.

Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/f6/api-hal/api-hal-irda.c

@@ -123,6 +123,9 @@ void api_hal_irda_rx_irq_init(void) {
 
     LL_TIM_SetCounter(TIM2, 0);
     LL_TIM_EnableCounter(TIM2);
+
+    NVIC_SetPriority(TIM2_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 0));
+    NVIC_EnableIRQ(TIM2_IRQn);
 }
 
 void api_hal_irda_rx_irq_deinit(void) {