ARM: dts: Fix the RTC DT node name for Exynos5250

Fixes the RTC DT node name for Exynos5250 as per the DT node naming
convention.
Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5.dtsi

@@ -95,7 +95,7 @@ serial@12C30000 {
 		interrupts = <0 54 0>;
 	};
 
-	rtc {
+	rtc@101E0000 {
 		compatible = "samsung,s3c6410-rtc";
 		reg = <0x101E0000 0x100>;
 		interrupts = <0 43 0>, <0 44 0>;

arch/arm/boot/dts/exynos5250-arndale.dts

@@ -538,7 +538,7 @@ timing0: timing@0 {
 		};
 	};
 
-	rtc {
+	rtc@101E0000 {
 		status = "okay";
 	};
 

arch/arm/boot/dts/exynos5250-snow.dts

@@ -171,7 +171,7 @@ keyboard-controller {
 		};
 	};
 
-	rtc {
+	rtc@101E0000 {
 		status = "okay";
 	};
 

arch/arm/boot/dts/exynos5250.dtsi

@@ -180,7 +180,7 @@ codec@11000000 {
 		clock-names = "mfc";
 	};
 
-	rtc {
+	rtc@101E0000 {
 		clocks = <&clock 337>;
 		clock-names = "rtc";
 	};