ARM: dts: imx8qxp-colibri: 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>
diff --git a/arch/arm/dts/fsl-imx8qxp-colibri-u-boot.dtsi b/arch/arm/dts/fsl-imx8qxp-colibri-u-boot.dtsi
index 87de9b5..322429a 100644
--- a/arch/arm/dts/fsl-imx8qxp-colibri-u-boot.dtsi
+++ b/arch/arm/dts/fsl-imx8qxp-colibri-u-boot.dtsi
@@ -56,6 +56,18 @@
 	u-boot,dm-pre-proper;
 };
 
+&pd_dma {
+	u-boot,dm-pre-proper;
+};
+
+&pd_dma_lpuart0 {
+	u-boot,dm-pre-proper;
+};
+
+&pd_dma_lpuart3 {
+	u-boot,dm-pre-proper;
+};
+
 &pd_conn {
 	u-boot,dm-pre-proper;
 };