Merge "documentation/ion: Add description for secure carveout heap"

  the following:

    - "SYSTEM"

    - "CARVEOUT"

    - "SECURE_CARVEOUT"

    - "DMA"

    - "HYP_CMA"

    - "SYSTEM_SECURE"

                 };

        };

"SECURE_CARVEOUT"

This heap type is expected to contain multiple child nodes. Each child node

shall contain the following required properties:

- memory-region:

Refer to Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt

- token:

A u32 containing the set of secure domains which will be able to access the

memory-region.

Example:

qcom,ion {

	compatible = "qcom,msm-ion";

	#address-cells = <1>;

	#size-cells = <0>;

	qcom,ion-heap@14 {

		reg = <14>;

		qcom,ion-heap-type = "SECURE_CARVEOUT";

		node1 {

			memory-region = <&cp_region>;

			token = <ION_FLAG_CP_TOUCH>;

		};

	};

};