Merge "Documentation: Add dt bindings for adsp-shmem-device"

ADSP shared memory device driver for ADSP fast boot camera

Required properties:

-  memory-region : start address and size of the shared memory region

Example:

	qcom,adsp {

		status = "ok";

		compatible = "adsp-shmem-device";

		memory-region = <&adsp_shmem_device_mem>;

		};