drivers: dma: remove usage of device_pm_control_nop

device_pm_control_nop is now deprecated in favour of NULL.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/drivers/dma/dma_stm32.c b/drivers/dma/dma_stm32.c
index 1857985..c0edcab 100644
--- a/drivers/dma/dma_stm32.c
+++ b/drivers/dma/dma_stm32.c
@@ -674,7 +674,7 @@
 									\
 DEVICE_DT_INST_DEFINE(index,						\
 		    &dma_stm32_init,					\
-		    device_pm_control_nop,				\
+		    NULL,						\
 		    &dma_stm32_data_##index, &dma_stm32_config_##index,	\
 		    PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT,	\
 		    &dma_funcs)