arm64: dts: lg: add missing cache properties

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

  lg1312-ref.dtb: l2-cache0: 'cache-level' is a required property

Acked-by: Chanho Min <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

Author: krzk

arch/arm64/boot/dts/lg/lg1312.dtsi

@@ -48,6 +48,8 @@
 		};
 		L2_0: l2-cache0 {
 			compatible = "cache";
+			cache-level = <2>;
+			cache-unified;
 		};
 	};
 

arch/arm64/boot/dts/lg/lg1313.dtsi

@@ -48,6 +48,8 @@
 		};
 		L2_0: l2-cache0 {
 			compatible = "cache";
+			cache-level = <2>;
+			cache-unified;
 		};
 	};