RDMA of ABOX IP

This device is an audio subsystem of Exynos AP

Required properties:

- compatible : "samsung,abox-rdma", "samsung,abox-rdma-compr"

- reg : address of SFR.

- reg-names : "sfr".

- samsung,id : id of the DMA.

- samsung,type : type of the DMA. "normal", "call", "compress", "realtime", "vi-sensing", "sync".

- samsung,buffer_type : type of the DMA buffer. "dma", "ion", "ram".

- #sound-dai-cells : 1

- sound-name-prefix : "ABOX RDMA0", "ABOX RDMA1", .......

Optional properties: no optional property.