arm64: dts: renesas: rzg2l: Add missing cache-level properties

The DeviceTree Specification v0.3 specifies that the cache node
'cache-level' property is 'required'.  Cf. s3.8 Multi-level and Shared
Cache Nodes.

Update the Device Trees accordingly.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Link: https://lore.kernel.org/r/20221107155825.1644604-19-pierre.gondois@arm.com
[geert: Update description]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r9a07g043u.dtsi

@@ -31,6 +31,7 @@ L3_CA55: cache-controller-0 {
 			compatible = "cache";
 			cache-unified;
 			cache-size = <0x40000>;
+			cache-level = <3>;
 		};
 	};
 

arch/arm64/boot/dts/renesas/r9a07g044.dtsi

@@ -109,6 +109,7 @@ L3_CA55: cache-controller-0 {
 			compatible = "cache";
 			cache-unified;
 			cache-size = <0x40000>;
+			cache-level = <3>;
 		};
 	};
 

arch/arm64/boot/dts/renesas/r9a07g054.dtsi

@@ -109,6 +109,7 @@ L3_CA55: cache-controller-0 {
 			compatible = "cache";
 			cache-unified;
 			cache-size = <0x40000>;
+			cache-level = <3>;
 		};
 	};