arm64: allwinner: h6: add R_INTC interrupt controller

Allwinner H6 SoC has also a R_INTC interrupt controller like Allwinner
A64 SoC, but has its base address changed due to the memory map change
in H6.

Add it into the device tree.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi

@@ -184,6 +184,15 @@ r_ccu: clock@7010000 {
 			#reset-cells = <1>;
 		};
 
+		r_intc: interrupt-controller@7021000 {
+			compatible = "allwinner,sun50i-h6-r-intc",
+				     "allwinner,sun6i-a31-r-intc";
+			interrupt-controller;
+			#interrupt-cells = <2>;
+			reg = <0x07021000 0x400>;
+			interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>;
+		};
+
 		r_pio: pinctrl@7022000 {
 			compatible = "allwinner,sun50i-h6-r-pinctrl";
 			reg = <0x07022000 0x400>;