riscv: dts: starfive: visionfive 2: use cpus label for timebase freq

As pointed out by Krzysztof "Board should not bring new CPU nodes.
Override by label instead."
Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi

@@ -26,10 +26,6 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
-	cpus {
-		timebase-frequency = <4000000>;
-	};
-
 	memory@40000000 {
 		device_type = "memory";
 		reg = <0x0 0x40000000 0x1 0x0>;
@@ -69,6 +65,10 @@ codec {
 	};
 };
 
+&cpus {
+	timebase-frequency = <4000000>;
+};
+
 &dvp_clk {
 	clock-frequency = <74250000>;
 };