arm64: dts: rockchip: px30: Move dmc into -u-boot.dtsi

dmc node is specific to U-Boot, it is always better practice
to maintain U-Boot specific nodes into -u-boot.dtsi files
in order to maintain Linux dts file sync compatibility.

Move the dmc into px30-u-boot.dtsi, also add dmc node
explicitly in rk3326-odroid-go2-u-boot.dtsi since it is
using px30.dts.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3326-odroid-go2-u-boot.dtsi b/arch/arm/dts/rk3326-odroid-go2-u-boot.dtsi
index ea36418..6de95be 100644
--- a/arch/arm/dts/rk3326-odroid-go2-u-boot.dtsi
+++ b/arch/arm/dts/rk3326-odroid-go2-u-boot.dtsi
@@ -17,6 +17,12 @@
 		spi0 = &sfc;
 	};
 
+	dmc {
+		u-boot,dm-pre-reloc;
+		compatible = "rockchip,px30-dmc", "syscon";
+		reg = <0x0 0xff2a0000 0x0 0x1000>;
+	};
+
 	rng: rng@ff0b0000 {
 		compatible = "rockchip,cryptov2-rng";
 		reg = <0x0 0xff0b0000 0x0 0x4000>;
@@ -38,10 +44,6 @@
 		<100000000>, <17000000>;
 };
 
-&dmc {
-	u-boot,dm-pre-reloc;
-};
-
 &gpio0 {
 	u-boot,dm-pre-reloc;
 };