arm64: dts: sc9860: add missing aon-prediv unit address

Nodes with "reg" property are supposed to have unit address, as reported
by dtc W=1 warning:

  sc9860.dtsi:210.26-216.5: Warning (simple_bus_reg): /soc/aon-prediv: simple-bus unit address format error, expected "402d0000"
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240401141128.98317-1-krzk@kernel.org

arch/arm64/boot/dts/sprd/sc9860.dtsi

@@ -207,7 +207,7 @@ ap_clk: clock-controller@20000000 {
 			#clock-cells = <1>;
 		};
 
-		aon_prediv: aon-prediv {
+		aon_prediv: aon-prediv@402d0000 {
 			compatible = "sprd,sc9860-aon-prediv";
 			reg = <0 0x402d0000 0 0x400>;
 			clocks = <&ext_26m>, <&pll 0>,