ARM: sun8i: v3s: add LRADC device node

Allwinner V3s features a LRADC like the ones in older SoCs.

Add a device tree node for it.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-v3s.dtsi

@@ -240,6 +240,13 @@ wdt0: watchdog@01c20ca0 {
 			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
+		lradc: lradc@1c22800 {
+			compatible = "allwinner,sun4i-a10-lradc-keys";
+			reg = <0x01c22800 0x400>;
+			interrupts = <GIC_SPI 30 IRQ_TYPE_LEVEL_HIGH>;
+			status = "disabled";
+		};
+
 		uart0: serial@01c28000 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x01c28000 0x400>;