dt-bindings: altera: Convert clkmgr binding to json-schema

Altera SOCFPGA Clock Manager

Required properties:

- compatible : "altr,clk-mgr"

- reg : Should contain base address and length for Clock Manager

Example:

	 clkmgr@ffd04000 {

		compatible = "altr,clk-mgr";

		reg = <0xffd04000 0x1000>;

	};

# SPDX-License-Identifier: GPL-2.0

%YAML 1.2

---

$id: http://devicetree.org/schemas/arm/altera/socfpga-clk-manager.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Altera SOCFPGA Clock Manager

maintainers:

  - Dinh Nguyen <dinguyen@kernel.org>

description: test

properties:

  compatible:

    items:

      - const: altr,clk-mgr

  reg:

    maxItems: 1

required:

  - compatible

examples:

  - |

    clkmgr@ffd04000 {

      compatible = "altr,clk-mgr";

      reg = <0xffd04000 0x1000>;

    };

...