ARM: dts: sun9i: Add CPUCFG device node for A80 dtsi

CPUCFG is a collection of registers that are mapped to the SoC's signals
from each individual processor core and associated peripherals, such as
resets for processors, L1/L2 cache and other things.

These registers are used for SMP bringup and CPU hotplugging.
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NChen-Yu Tsai <wens@csie.org>

arch/arm/boot/dts/sun9i-a80.dtsi

@@ -363,6 +363,11 @@
 			#reset-cells = <1>;
 		};
 
+		cpucfg@1700000 {
+			compatible = "allwinner,sun9i-a80-cpucfg";
+			reg = <0x01700000 0x100>;
+		};
+
 		mmc0: mmc@1c0f000 {
 			compatible = "allwinner,sun9i-a80-mmc";
 			reg = <0x01c0f000 0x1000>;