ARM: shmobile: emev2 dtsi: Add uart* labels for easier referencing

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/emev2.dtsi

@@ -137,7 +137,7 @@ timer@e0180000 {
 		clock-names = "sclk";
 	};
 
-	serial@e1020000 {
+	uart0: serial@e1020000 {
 		compatible = "renesas,em-uart";
 		reg = <0xe1020000 0x38>;
 		interrupts = <0 8 IRQ_TYPE_LEVEL_HIGH>;
@@ -145,7 +145,7 @@ serial@e1020000 {
 		clock-names = "sclk";
 	};
 
-	serial@e1030000 {
+	uart1: serial@e1030000 {
 		compatible = "renesas,em-uart";
 		reg = <0xe1030000 0x38>;
 		interrupts = <0 9 IRQ_TYPE_LEVEL_HIGH>;
@@ -153,7 +153,7 @@ serial@e1030000 {
 		clock-names = "sclk";
 	};
 
-	serial@e1040000 {
+	uart2: serial@e1040000 {
 		compatible = "renesas,em-uart";
 		reg = <0xe1040000 0x38>;
 		interrupts = <0 10 IRQ_TYPE_LEVEL_HIGH>;
@@ -161,7 +161,7 @@ serial@e1040000 {
 		clock-names = "sclk";
 	};
 
-	serial@e1050000 {
+	uart3: serial@e1050000 {
 		compatible = "renesas,em-uart";
 		reg = <0xe1050000 0x38>;
 		interrupts = <0 11 IRQ_TYPE_LEVEL_HIGH>;