arm64: dts: uniphier: fix no unit name warnings

Fix warnings reported when built with W=1:
  Node /memory has a reg or ranges property, but no unit name
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm64/boot/dts/socionext/uniphier-ld11-ref.dts

@@ -52,7 +52,7 @@ / {
 	model = "UniPhier LD11 Reference Board";
 	compatible = "socionext,uniphier-ld11-ref", "socionext,uniphier-ld11";
 
-	memory {
+	memory@80000000 {
 		device_type = "memory";
 		reg = <0 0x80000000 0 0x40000000>;
 	};

arch/arm64/boot/dts/socionext/uniphier-ld11.dtsi

@@ -140,7 +140,7 @@ timer {
 			     <1 10 4>;
 	};
 
-	soc {
+	soc@0 {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;

arch/arm64/boot/dts/socionext/uniphier-ld20-ref.dts

@@ -52,7 +52,7 @@ / {
 	model = "UniPhier LD20 Reference Board";
 	compatible = "socionext,uniphier-ld20-ref", "socionext,uniphier-ld20";
 
-	memory {
+	memory@80000000 {
 		device_type = "memory";
 		reg = <0 0x80000000 0 0xc0000000>;
 	};

arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi

@@ -209,7 +209,7 @@ timer {
 			     <1 10 4>;
 	};
 
-	soc {
+	soc@0 {
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;