ARM: dts: imx8qm-apalis: dm-pre-proper for pd_dma nodes

pd_dma_* nodes should be accessible during pre-relocation stage of
U-Boot proper for properly handling power domains.

This fixes the issue with permanent failing of invocation of
power_domain_get_by_index() in the common code of DM power domain
uclass (drivers/power/domain/power-domain-uclass.c).

Fixes: f0cc4eae9a ("core: device: use dev_power_domain_on")
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>

arch/arm/dts/fsl-imx8qm-apalis-u-boot.dtsi

@@ -51,6 +51,14 @@
 	u-boot,dm-pre-proper;
 };
 
+&pd_dma {
+	u-boot,dm-pre-proper;
+};
+
+&pd_dma_lpuart1 {
+	u-boot,dm-pre-proper;
+};
+
 &pd_conn {
 	u-boot,dm-pre-proper;
 };