ARM: dts: Re-organize RTC status for exynos5420

Some boards might not have RTC xtal, so RTC shouldn't really be
enabled by default. Enable it in the required board files.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5420-arndale-octa.dts

@@ -31,6 +31,10 @@
 		};
 	};
 
+	rtc@101E0000 {
+		status = "okay";
+	};
+
 	mmc@12200000 {
 		status = "okay";
 		broken-cd;

arch/arm/boot/dts/exynos5420-smdk5420.dts

@@ -31,6 +31,10 @@
 		};
 	};
 
+	rtc@101E0000 {
+		status = "okay";
+	};
+
 	mmc@12200000 {
 		status = "okay";
 		broken-cd;

arch/arm/boot/dts/exynos5420.dtsi

@@ -271,7 +271,7 @@
 	rtc@101E0000 {
 		clocks = <&clock 317>;
 		clock-names = "rtc";
-		status = "okay";
+		status = "disabled";
 	};
 
 	amba {