arm64: dts: r8a7796: Add CA53 L2 cache-controller node

Add a device node for the Cortex-A53 L2 cache-controller.

The L2 cache for the Cortex-A53 CPU cores is 512 KiB large (organized as
32 KiB x 16 ways).

Extracted from a patch by Takeshi Kihara in the BSP.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a7796.dtsi

@@ -61,6 +61,13 @@ L2_CA57: cache-controller-0 {
 			cache-unified;
 			cache-level = <2>;
 		};
+
+		L2_CA53: cache-controller-1 {
+			compatible = "cache";
+			power-domains = <&sysc R8A7796_PD_CA53_SCU>;
+			cache-unified;
+			cache-level = <2>;
+		};
 	};
 
 	extal_clk: extal {