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 <[e-mail]>
Acked-by: Stefan Agner <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/vf610.dtsi

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