exynos: dts: Sync up I2C ports with the kernel

The kernel uses upper case for I2C unit addresses. Follow the same
convention to reduce differences.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
diff --git a/arch/arm/dts/exynos5250.dtsi b/arch/arm/dts/exynos5250.dtsi
index ccbafe9..7eef3e3 100644
--- a/arch/arm/dts/exynos5250.dtsi
+++ b/arch/arm/dts/exynos5250.dtsi
@@ -47,36 +47,36 @@
 		interrupts = <0 47 0>;
 	};
 
-	i2c@12ca0000 {
-		#address-cells = <1>;
-		#size-cells = <0>;
+	i2c_4: i2c@12CA0000 {
 		compatible = "samsung,s3c2440-i2c";
 		reg = <0x12CA0000 0x100>;
 		interrupts = <0 60 0>;
-	};
-
-	i2c@12cb0000 {
 		#address-cells = <1>;
 		#size-cells = <0>;
+	};
+
+	i2c_5: i2c@12CB0000 {
 		compatible = "samsung,s3c2440-i2c";
 		reg = <0x12CB0000 0x100>;
 		interrupts = <0 61 0>;
-	};
-
-	i2c@12cc0000 {
 		#address-cells = <1>;
 		#size-cells = <0>;
+	};
+
+	i2c_6: i2c@12CC0000 {
 		compatible = "samsung,s3c2440-i2c";
 		reg = <0x12CC0000 0x100>;
 		interrupts = <0 62 0>;
-	};
-
-	i2c@12cd0000 {
 		#address-cells = <1>;
 		#size-cells = <0>;
+	};
+
+	i2c_7: i2c@12CD0000 {
 		compatible = "samsung,s3c2440-i2c";
 		reg = <0x12CD0000 0x100>;
 		interrupts = <0 63 0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
 	};
 
 	sound@3830000 {