arm64: dts: renesas: r8a77990: Revise the cache controller node

The cache controller node should not have unit-addresses and reg
properties. So, this patch removes them.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77990.dtsi

@@ -27,9 +27,8 @@ a53_0: cpu@0 {
 			enable-method = "psci";
 		};
 
-		L2_CA53: cache-controller@0 {
+		L2_CA53: cache-controller-0 {
 			compatible = "cache";
-			reg = <0>;
 			power-domains = <&sysc 21>;
 			cache-unified;
 			cache-level = <2>;