arm64: dts: mt8183: Fix unit name warnings

Remove the unit address from the DT nodes that doesn't have a reg
property. This fixes the following unit name warnings:

  Warning (unit_address_vs_reg): /cpus/idle-states/cluster-sleep@0: node has a unit name, but no reg or ranges property
  Warning (unit_address_vs_reg): /cpus/idle-states/cluster-sleep@1: node has a unit name, but no reg or ranges property
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Link: https://lore.kernel.org/r/20200625101757.101775-5-enric.balletbo@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/boot/dts/mediatek/mt8183.dtsi

@@ -168,7 +168,7 @@ CPU_SLEEP: cpu-sleep {
 				min-residency-us = <800>;
 			};
 
-			CLUSTER_SLEEP0: cluster-sleep@0 {
+			CLUSTER_SLEEP0: cluster-sleep-0 {
 				compatible = "arm,idle-state";
 				local-timer-stop;
 				arm,psci-suspend-param = <0x01010001>;
@@ -176,7 +176,7 @@ CLUSTER_SLEEP0: cluster-sleep@0 {
 				exit-latency-us = <400>;
 				min-residency-us = <1000>;
 			};
-			CLUSTER_SLEEP1: cluster-sleep@1 {
+			CLUSTER_SLEEP1: cluster-sleep-1 {
 				compatible = "arm,idle-state";
 				local-timer-stop;
 				arm,psci-suspend-param = <0x01010001>;