dt-bindings: interrupt-controller: loongarch: Fix mismatched compatible

The "compatible" doesn't match what the kernel is using. Fix it as
kernel using.

Fixes: 6b2748ad ("dt-bindings: interrupt-controller: add yaml for LoongArch CPU interrupt controller")
Reported-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/all/20221208020954.GA3368836-robh@kernel.org/Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Liu Peibao <liupeibao@loongson.cn>
Link: https://lore.kernel.org/r/20230401091304.12633-1-liupeibao@loongson.cn
[robh: Rename file to match compatible, fix subject typo]
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/loongarch,cpu-interrupt-controller.yaml → Documentation/devicetree/bindings/interrupt-controller/loongson,cpu-interrupt-controller.yaml

 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/interrupt-controller/loongarch,cpu-interrupt-controller.yaml#
+$id: http://devicetree.org/schemas/interrupt-controller/loongson,cpu-interrupt-controller.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: LoongArch CPU Interrupt Controller
@@ -11,7 +11,7 @@ maintainers:
 
 properties:
   compatible:
-    const: loongarch,cpu-interrupt-controller
+    const: loongson,cpu-interrupt-controller
 
   '#interrupt-cells':
     const: 1
@@ -28,7 +28,7 @@ required:
 examples:
   - |
     interrupt-controller {
-      compatible = "loongarch,cpu-interrupt-controller";
+      compatible = "loongson,cpu-interrupt-controller";
       #interrupt-cells = <1>;
       interrupt-controller;
     };