ARM: dts: vf610: Align L2 cache-controller nodename with dtschema

Fix dtschema validator warnings like:
    l2-cache@40006000: $nodename:0:
        'l2-cache@40006000' does not match '^(cache-controller|cpu)(@[0-9a-f,]+)*$'
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/vf610.dtsi

@@ -10,7 +10,7 @@ &a5_cpu {
 };
 
 &aips0 {
-	L2: l2-cache@40006000 {
+	L2: cache-controller@40006000 {
 		compatible = "arm,pl310-cache";
 		reg = <0x40006000 0x1000>;
 		cache-unified;