ARM: dts: am57xx: cl-som-am57x: dts: add RTC support

Add EM3027 RTC chip support (over I2C4 bus).
Signed-off-by: Dmitry Lifshitz <lifshitz@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am57xx-cl-som-am57x.dts

@@ -242,6 +242,11 @@ tps659038_gpio: tps659038_gpio {
 			#gpio-cells = <2>;
 		};
 	};
+
+	rtc0: rtc@56 {
+		compatible = "emmicro,em3027";
+		reg = <0x56>;
+	};
 };
 
 &cpu0 {