ARM: dts: mmp3: Fix L2 cache controller node name

The current one makes validation unhappy:

  mmp3-dell-ariel.dt.yaml: l2-cache-controller@d0020000: $nodename:0:
      'l2-cache-controller@d0020000' does not match
      '^(cache-controller|cpu)(@[0-9a-f,]+)*$'
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/mmp3.dtsi

@@ -523,7 +523,7 @@ ssp4: spi@d4039000 {
 			};
 		};
 
-		l2: l2-cache-controller@d0020000 {
+		l2: cache-controller@d0020000 {
 			compatible = "marvell,tauros3-cache", "arm,pl310-cache";
 			reg = <0xd0020000 0x1000>;
 			cache-unified;