arm64: allwinner: h6: add PCF8563 RTC on Pine H64 board

Pine H64 board has a PCF8563 dedicated RTC connected to its R_I2C bus.

Enable the R_I2C bus and add the RTC to the device tree.
Signed-off-by: NIcenowy Zheng <icenowy@aosc.io>
Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/boot/dts/allwinner/sun50i-h6-pine-h64.dts

@@ -22,6 +22,16 @@
 	};
 };
 
+&r_i2c {
+	status = "okay";
+
+	pcf8563: rtc@51 {
+		compatible = "nxp,pcf8563";
+		reg = <0x51>;
+		#clock-cells = <0>;
+	};
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_ph_pins>;