dt-bindings: timer: Convert mrvl,mmp-timer to json-schema

* Marvell MMP Timer controller

Required properties:

- compatible : Should be "mrvl,mmp-timer".

- reg : Address and length of the register set of timer controller.

- interrupts : Should be the interrupt number.

Optional properties:

- clocks : Should contain a single entry describing the clock input.

Example:

	timer0: timer@d4014000 {

		compatible = "mrvl,mmp-timer";

		reg = <0xd4014000 0x100>;

		interrupts = <13>;

		clocks = <&coreclk 2>;

	};

# SPDX-License-Identifier: GPL-2.0-only

%YAML 1.2

---

$id: http://devicetree.org/schemas/timer/mrvl,mmp-timer.yaml#

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

title: Marvell MMP Timer bindings

maintainers:

  - Daniel Lezcano <daniel.lezcano@linaro.org>

  - Thomas Gleixner <tglx@linutronix.de>

  - Rob Herring <robh+dt@kernel.org>

properties:

  $nodename:

    pattern: '^timer@[a-f0-9]+$'

  compatible:

    const: mrvl,mmp-timer

  reg:

    maxItems: 1

  interrupts:

    maxItems: 1

  clocks:

    maxItems: 1

required:

  - compatible

  - reg

  - interrupts

additionalProperties: false

examples:

  - |

    timer@d4014000 {

        compatible = "mrvl,mmp-timer";

        reg = <0xd4014000 0x100>;

        interrupts = <13>;

        clocks = <&coreclk 2>;

    };

...