ARM: u300: add RTC to device tree

This adds the COH 901 331 RTC to the U300 device tree.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/arch/arm/boot/dts/ste-u300.dts b/arch/arm/boot/dts/ste-u300.dts
index f0eb5f4..711a2d9 100644
--- a/arch/arm/boot/dts/ste-u300.dts
+++ b/arch/arm/boot/dts/ste-u300.dts
@@ -56,6 +56,13 @@
 		interrupts = <3>;
 	};
 
+	rtc: rtc@c0017000 {
+		compatible = "stericsson,coh901331";
+		reg = <0xc0017000 0x1000>;
+		interrupt-parent = <&vicb>;
+		interrupts = <10>;
+	};
+
 	i2c0: i2c@c0004000 {
 		compatible = "st,ddci2c";
 		reg = <0xc0004000 0x1000>;