dma: stm32: dma_stm32_slot_to_channel is only applicable on STM32Fx

The dma_stm32_slot_to_channel function is only applicable on the STM32Fx series since the LL_DMA_CHANNEL_x macros only exist for those platforms among the one based on st,stm32-dma-v1. While checking for !defined(CONFIG_DMAMUX_STM32) is ok to enable this on STM32Fx, it prevents to disable dmamux on other platforms since required symbols do not exist. Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Author: Alain Volmat

drivers/dma/dma_stm32_v1.c

@@ -35,7 +35,7 @@ uint32_t dma_stm32_id_to_stream(uint32_t id)
 return stream_nr[id];
 }
 
-#if !defined(CONFIG_DMAMUX_STM32)
+#if !defined(CONFIG_SOC_SERIES_STM32H7X) && !defined(CONFIG_SOC_SERIES_STM32MP1X)
 uint32_t dma_stm32_slot_to_channel(uint32_t slot)
 {
 static const uint32_t channel_nr[] = {