ARM: dts: sun8i: add rtc device node

sun8i shares the same rtc hardware as sun6i. Now that we have a driver
for it, add a device node to the DTSI for it so we can use it.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-a23.dtsi

@@ -285,6 +285,12 @@ gic: interrupt-controller@01c81000 {
 			interrupts = <1 9 0xf04>;
 		};
 
+		rtc: rtc@01f00000 {
+			compatible = "allwinner,sun6i-a31-rtc";
+			reg = <0x01f00000 0x54>;
+			interrupts = <0 40 4>, <0 41 4>;
+		};
+
 		prcm@01f01400 {
 			compatible = "allwinner,sun8i-a23-prcm";
 			reg = <0x01f01400 0x200>;