ARM: sun8i: dt: Enable A23 SMP support

Add enable-method property to enable SMP support.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

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

@@ -81,6 +81,7 @@
 	};
 
 	cpus {
+		enable-method = "allwinner,sun8i-a23";
 		#address-cells = <1>;
 		#size-cells = <0>;
 
@@ -593,6 +594,11 @@
 			};
 		};
 
+		cpucfg@01f01c00 {
+			compatible = "allwinner,sun8i-a23-cpuconfig";
+			reg = <0x01f01c00 0x300>;
+		};
+
 		r_uart: serial@01f02800 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x01f02800 0x400>;