ARM: dts: Add RTC DT node to Exynos5420 SoC

Adds RTC DT node to Exynos5420 SoC
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/exynos5420.dtsi

@@ -180,6 +180,12 @@ pinctrl_4: pinctrl@03860000 {
 		interrupts = <0 47 0>;
 	};
 
+	rtc@101E0000 {
+		clocks = <&clock 317>;
+		clock-names = "rtc";
+		status = "okay";
+	};
+
 	serial@12C00000 {
 		clocks = <&clock 257>, <&clock 128>;
 		clock-names = "uart", "clk_uart_baud0";