ARM: socfpga: dts: add rtc on i2c0 to socrates

The SOCrates has an M41T82M RTC on i2c0. Add it.
Signed-off-by: NSteffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: NDinh Nguyen <dinguyen@altera.com>

arch/arm/boot/dts/socfpga_cyclone5_socrates.dts

@@ -36,6 +36,15 @@
 	status = "okay";
 };
 
+&i2c0 {
+	status = "okay";
+
+	rtc: rtc@68 {
+		compatible = "stm,m41t82";
+		reg = <0x68>;
+	};
+};
+
 &mmc {
 	status = "okay";
 };