dt-bindings: arm: hisilicon: convert hisilicon,pctrl bindings to json-schema

Convert the Hisilicon peripheral misc control register binding to DT
schema format using json-schema.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20200929141454.2312-13-thunder.leizhen@huawei.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/hisilicon/controller/hisilicon,pctrl.txt

-PCTRL: Peripheral misc control register
-
-Required Properties:
-- compatible: "hisilicon,pctrl"
-- reg: Address and size of pctrl.
-
-Example:
-
-	/* for Hi3620 */
-	pctrl: pctrl@fca09000 {
-		compatible = "hisilicon,pctrl";
-		reg = <0xfca09000 0x1000>;
-	};

Documentation/devicetree/bindings/arm/hisilicon/controller/pctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/hisilicon/controller/pctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Peripheral misc control register
+
+maintainers:
+  - Wei Xu <xuwei5@hisilicon.com>
+
+description: Peripheral misc control register
+
+properties:
+  compatible:
+    items:
+      - const: hisilicon,pctrl
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    pctrl@fca09000 {
+        compatible = "hisilicon,pctrl";
+        reg = <0xfca09000 0x1000>;
+    };
+...