arm64: dts: arm: add missing cache properties

As all level 2 and level 3 caches are unified, add required
cache-unified properties to fix warnings like:

  foundation-v8.dtb: l2-cache0: 'cache-unified' is a required property
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230421223213.115639-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Sudeep Holla <sudeep.holla@arm.com>

arch/arm64/boot/dts/arm/foundation-v8.dtsi

@@ -59,6 +59,7 @@ cpu3: cpu@3 {
 		L2_0: l2-cache0 {
 			compatible = "cache";
 			cache-level = <2>;
+			cache-unified;
 		};
 	};
 

arch/arm64/boot/dts/arm/rtsm_ve-aemv8a.dts

@@ -72,6 +72,7 @@ cpu@3 {
 		L2_0: l2-cache0 {
 			compatible = "cache";
 			cache-level = <2>;
+			cache-unified;
 		};
 	};
 

arch/arm64/boot/dts/arm/vexpress-v2f-1xv7-ca53x2.dts

@@ -58,6 +58,7 @@ cpu@1 {
 		L2_0: l2-cache0 {
 			compatible = "cache";
 			cache-level = <2>;
+			cache-unified;
 		};
 	};