dt-bindings: hwlock: qcom-hwspinlock: correct example indentation

Use some consistent indentation (4-space) for DTS example.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220909092035.223915-3-krzysztof.kozlowski@linaro.org

Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.yaml

@@ -43,9 +43,9 @@ additionalProperties: false
 
 examples:
   - |
-        tcsr_mutex: hwlock@1f40000 {
-                compatible = "qcom,tcsr-mutex";
-                reg = <0x01f40000 0x40000>;
-                #hwlock-cells = <1>;
-        };
+    hwlock@1f40000 {
+        compatible = "qcom,tcsr-mutex";
+        reg = <0x01f40000 0x40000>;
+        #hwlock-cells = <1>;
+    };
 ...