stmhal/dma: mark DMA sate as READY even if HAL_DMA_Init is skipped

Current version of HAL drivers checks if `hdma->State == HAL_DMA_STATE_READY`
before executing some functions.

stmhal/dma.c

@@ -436,6 +436,7 @@ void dma_init(DMA_HandleTypeDef *dma, const dma_descr_t *dma_descr, void *data){
             HAL_NVIC_SetPriority(dma_irqn[dma_id], IRQ_PRI_DMA, IRQ_SUBPRI_DMA);
         } else {
             // only necessary initialization
+            dma->State = HAL_DMA_STATE_READY;
 #if defined(MCU_SERIES_F4)
             // calculate DMA base address and bitshift to be used in IRQ handler
             extern uint32_t DMA_CalcBaseAndBitshift(DMA_HandleTypeDef *hdma);