dt-bindings: nvmem: Convert MXS OCOTP to json-schema

Convert the MXS OCOTP binding to DT schema format using json-schema.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/nvmem/mxs-ocotp.txt

-On-Chip OTP Memory for Freescale i.MX23/i.MX28
-
-Required properties :
-- compatible :
-  - "fsl,imx23-ocotp" for i.MX23
-  - "fsl,imx28-ocotp" for i.MX28
-- #address-cells : Should be 1
-- #size-cells : Should be 1
-- reg : Address and length of OTP controller registers
-- clocks : Should contain a reference to the hbus clock
-
-= Data cells =
-Are child nodes of mxs-ocotp, bindings of which as described in
-bindings/nvmem/nvmem.txt
-
-Example for i.MX28:
-
-	ocotp: ocotp@8002c000 {
-		compatible = "fsl,imx28-ocotp", "fsl,ocotp";
-		#address-cells = <1>;
-		#size-cells = <1>;
-		reg = <0x8002c000 0x2000>;
-		clocks = <&clks 25>;
-	};

Documentation/devicetree/bindings/nvmem/mxs-ocotp.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/mxs-ocotp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: On-Chip OTP Memory for Freescale i.MX23/i.MX28
+
+maintainers:
+  - Anson Huang <Anson.Huang@nxp.com>
+
+allOf:
+  - $ref: "nvmem.yaml#"
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx23-ocotp
+      - fsl,imx28-ocotp
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    ocotp: efuse@8002c000 {
+        compatible = "fsl,imx28-ocotp";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        reg = <0x8002c000 0x2000>;
+        clocks = <&clks 25>;
+    };
+
+...