dt-bindings: Add Dt binding for rimps mailbox

%YAML 1.2

---

$id: http://devicetree.org/schemas/bindings/soc/qcom/qcom,rimps.yaml#

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

title: Qualcomm Technologies, Inc. Rimps Mailbox controller driver

description: |

  This mailbox controller act as interface to do doorbell between

  HLOS and Rimps subsystem.

properties:

  compatible:

    Usage: required

    Value type: <string>

    Definition: Must be "qcom,rimps"

example:

  - |

    qcom,rimps@0f400000 {

	#address-cells = <2>;

	#size-cells = <2>;

	compatible = "qcom,rimps";

	reg =   <0x0f400000 0x10>,

	<0x0fd90000 0x2000>;

	#mbox-cells = <1>;

	status = "ok";

	};