arm64: dts: uniphier: Fix opp-table node name for LD20

To fix dtbs_check warning:

uniphier-ld20-akebi96.dt.yaml: opp-table0: $nodename:0: 'opp-table0' does not match '^opp-table(-[a-z0-9]+)?$'
        From schema: Documentation/devicetree/bindings/opp/opp-v2.yaml
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042321.4817-9-hayashi.kunihiko@socionext.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm64/boot/dts/socionext/uniphier-ld20.dtsi

@@ -81,7 +81,7 @@ cpu3: cpu@101 {
 		};
 	};
 
-	cluster0_opp: opp-table0 {
+	cluster0_opp: opp-table-0 {
 		compatible = "operating-points-v2";
 		opp-shared;
 
@@ -119,7 +119,7 @@ opp-1100000000 {
 		};
 	};
 
-	cluster1_opp: opp-table1 {
+	cluster1_opp: opp-table-1 {
 		compatible = "operating-points-v2";
 		opp-shared;