arm64: allwinner: a64: add AXP803 node to Pine64 device tree

The Pine64 (including Pine64+) boards have an AXP803 as its main PMIC.

Add its device node.
Signed-off-by: NIcenowy Zheng <icenowy@aosc.io>
Signed-off-by: NChen-Yu Tsai <wens@csie.org>

arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts

@@ -123,6 +123,17 @@
 	status = "okay";
 };
 
+&r_rsb {
+	status = "okay";
+
+	axp803: pmic@3a3 {
+		compatible = "x-powers,axp803";
+		reg = <0x3a3>;
+		interrupt-parent = <&r_intc>;
+		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
+	};
+};
+
 /* On Exp and Euler connectors */
 &uart0 {
 	pinctrl-names = "default";