arm64: dts: whale2: add missing ap-apb unit address

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

  whale2.dtsi:67.10-116.5: Warning (simple_bus_reg): /soc/ap-apb: simple-bus unit address format error, expected "70000000"
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240401141128.98317-4-krzk@kernel.org

arch/arm64/boot/dts/sprd/whale2.dtsi

@@ -64,7 +64,7 @@ ap_apb_regs: syscon@70b00000 {
 			reg = <0 0x70b00000 0 0x40000>;
 		};
 
-		ap-apb {
+		ap-apb@70000000 {
 			compatible = "simple-bus";
 			#address-cells = <1>;
 			#size-cells = <1>;