rockchip: dts: rk3399: Add u-boot, dm-pre-reloc for pmu

Add u-boot,dm-pre-reloc property for pmu in rk3399-u-boot.dtsi
so-that SPL can access pmu.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3399-u-boot.dtsi b/arch/arm/dts/rk3399-u-boot.dtsi
index fcfce9a..2738a38 100644
--- a/arch/arm/dts/rk3399-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-u-boot.dtsi
@@ -3,6 +3,10 @@
  * Copyright (C) 2019 Jagan Teki <jagan@amarulasolutions.com>
  */
 
+&pmu {
+	u-boot,dm-pre-reloc;
+};
+
 &sdmmc {
 	u-boot,dm-pre-reloc;
 };