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

Fix dtschema validator warnings like:
     l2-cache-controller@c4200000: $nodename:0:
         'l2-cache-controller@c4200000' does not match '^(cache-controller|cpu)(@[0-9a-f,]+)*$'

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Kevin Hilman <[email protected]>
Reviewed-by: Martin Blumenstingl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: krzk

arch/arm/boot/dts/meson.dtsi

@@ -11,7 +11,7 @@
 	#size-cells = <1>;
 	interrupt-parent = <&gic>;
 
-	L2: l2-cache-controller@c4200000 {
+	L2: cache-controller@c4200000 {
 		compatible = "arm,pl310-cache";
 		reg = <0xc4200000 0x1000>;
 		cache-unified;