ARM: dts: uniphier: fix no unit name warnings

Fix warnings reported when built with W=1, by DTC 1.4.2 or later:
  Node /memory has a reg or ranges property, but no unit name

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/dts/uniphier-ld11-ref.dts b/arch/arm/dts/uniphier-ld11-ref.dts
index 7693bf2..1b5f2d8 100644
--- a/arch/arm/dts/uniphier-ld11-ref.dts
+++ b/arch/arm/dts/uniphier-ld11-ref.dts
@@ -16,6 +16,10 @@
 	model = "UniPhier LD11 Reference Board";
 	compatible = "socionext,uniphier-ld11-ref", "socionext,uniphier-ld11";
 
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
 	aliases {
 		serial0 = &serial0;
 		serial1 = &serial1;
@@ -29,14 +33,10 @@
 		i2c5 = &i2c5;
 	};
 
-	memory {
+	memory@80000000 {
 		device_type = "memory";
 		reg = <0 0x80000000 0 0x40000000>;
 	};
-
-	chosen {
-		stdout-path = "serial0:115200n8";
-	};
 };
 
 &ethsc {